Assuming that I did, here I go:
First off, I feel like the abilities of Haki, or one's use of it, should be put on the character's page, just for convenience
Now, onto the fight. Boa's new things certainly make this a lot tougher. Precognition can allow her to (I'm going to assume "see" what exactly is going to happen throughout the ENTIRE course of the battle), and AP/Dura is a big boon as well
However, I had assumed that her Slave Arrow wasn't something Gunvolt can use the Flashfield to defend, and had to rely on using things like Crashbolt or other Skills to blast them out of the way. It would seem that I was wrong. If it wasn't for the new addition to Precognition, I would've said that it would completely affect the favor to GV's side, since really, Slave Arrow was essentially all Boa had going for her.
Now, while I disagree with the whole low durability stone thing going on, I'm just going to assume that this is the case. What are her means of Petrification? Melee, Slave Arrow, and Femurr Lust thingie. Each of these are... completely nothing to worry about for GV. Slave Arrow is easily block by Flashfield, and if it's a constant storm for... some reason (though, from what I know now, it has a wind up and doesn't last long), not only do I have the confidence that he can dodge them, but Infinite Surge or Split Second essentially make that a non-issue. Femurr, Gunvolt is 14, 8th Grade, while I think that's around the age where boys get pervy... Gunvolt never shows any sign of remotely being attracted to anyone, and at times is completely oblivious to Joule and Quinn to an extent, so that's not working. Last but not least is Melee. While I admit that her CQC is most likely better (since GV has never shown H2H, just said that he does it), being in Melee range is the last thing that she wants VS Gunvolt. Astrasphere, Flashfield, Crashbolt, and on a lesser note, Dragonsphere, Luxcaliber are all things that just, really hurt at close range.
While the point has been made that she can predict and activate Arm. Haki, I strongly believe that it won't allow her to just walk through an entire Astrasphere or anything of the sort. Gunvolt, like Boa, scales far above Ghauri in Attack Power, Ghauri's ram is actually (where the AP comes from), one of the weakest moves he has, and Gunvolt's Tagged Flashfield, his most basic attack, shreds even the boss's health quite easily, and MUCH faster when GV equips the Micheal Clip (basically, allows only one tag at a time, but results in absurd damage from Flashfield). So, even assuming that Boa does somehow have the AP/Dura Advantage, whatever intercepts her primary method of attack in this scenario is... yeah… it will at LEAST push her back. Her methods of winning are essentially, shut down. This is not mentioning Septimal Surge and Shield, which straight up just double Gunvolt's output.
Now, as for actually hitting and beating her, Gunvolt is going to have a tough time, no doubt, due to me assuming that Precognition is super duper broken and she can just know everything he does. However, just because she knows what's going to happen, does not guarantee that she is going to avoid attacks. You can know that something is coming, and when, and still screw up the timing, when, say, defending a really hard hit in table tennis. This is especially true when Voltaic Chains is around to either stab or grapple you from all angles, pinning you while you're being electrocuted plenty, and setting up for a Tag that isn't avoidable due to such circumstances.
I do not have the knowledge to say that she can't dodge all of GV's arsenal since I don't know her experience with Danmaku, but what I ca say is that all of that is much more difficult when on the offensive, and especially if your only hope of touching someone is getting up close (remember, Slave Arrow doesn't work, and really, just gives an opportunity for GV to shoot her). Not only does Gunvolt want to stay away from a CQC fight, and has Anti-CQC measures, but her going for a melee strike gives openings, lots of them for counterplay. Whenever you attack, you give an opening, and especially if someone's primary method of attack is shooting with a damn gun… uuuuh, yeah, not the best idea when said gunshot chains into basically a completely unavoidable attack that can't be blocked, or dodged. This is also especially true when Astrasphere, or, if she's jumping, an unavoidable Luxcaliber or Voltaic Chains since no dodging mid-air is threatening her at all times.
On that note, electricity may or may not be Dura Negation, but I'm not going to say it is for the sake of arguments.
And speaking of Jumping, Gunvolt also has many means of jumping and staying in the air while still attacking for a very long time, his Contact Lens (notably the one that save up more EP) and Rings which allow Air Hops and Air Dashes. This could force Boa to jump, and thus, make herself unable to dodge any blow GV chooses. And if GV runs out of EP? Split Second. Easy.
Now yes, she can predict it, but even if you know it's coming, while you're trying to attack them, you have a lot less, if any means of escaping the incoming attack, as your attack is meant to make them not attack in return. It's much easier to point a gun and shoot as a countermeasure compared to some hand to hand skill. Now yeah, you may be saying "just use Arm. Haki", but unluckily for her, there's an issue. Remember, she's not only having to dodge and weave through all of Gunvolt's ranged attacks just to get close, she'll be giving Gunvolt a to of time to realize what she is doing to switch to Naga, a type of Bolt (the tagging stuff) that pieces through defenses, even walls and shields that all other types of Bolts can't go through, which means… Boa just sold herself a free tag, and massive damage. And if all fails, Chargeguard Pendant can straight up allow GV to be immune to strike during his EP Charge.
Speaking of Precognition, Gunvolt has another type of unavoidable Bolt, the Vasuki, which allows a homing tag once GV strikes a taggable object. Considering that technically everything is taggable, GV could strike, say a pillar or the throne, and there it is, free tag and Flashfield.
All and all, without Slave Arrow being as effective as I through it would, Boa is left with no choice but to close the distance for a strike, which is… really just too much effort considering all of the Anti-CQC Gunvolt has. Gunvolt, Mid/High-Diff.