Comics shouldn't really be compared to the MCU or other verses tbh, they should have way stricter standards of scaling or everyone scales to everybody, not just one or two occasions of doing minor damage to someone. But I don't know enough about X-23 and her consistent power level so I'll stay away form that debate.
Anyway
The "downscaling" people in Zark's sandbox would be 8-C right?
I agree with 9-A+ for the "down downscaling" people, Bucky's feat is close enough to that and it's been consistently shown that Cap is physically weaker than Wolverine but can hold his own in a brawl.
Personally I prefer basing ratings off actual showings more and Sabretooth can also get the "at least, possibly" rating like due to his inconsistency like Nuke but I'm fine with it either way because in this case it's also valid that he's supposedly at least the same as Wolverine.
On Nuke I think it's a bit harsh to say that Wolverine did nothing against him in the first scan, they were just kinda trading blows and Nuke got the upper hand. In the second scan you could say Wolverine kinda caught him off guard and rammed him repeatedly which is why he bled so bad, though admittedly it's difficult to excuse getting rekt like that. He is pretty clearly stronger than Captain America though, even
in the fight Cap "won" he kinda ambushed him and spammed shield bashes and looked pretty hurt by a kick by Nuke while his non-shield hits didn't do much damage (if anything tanking shield throws from a Cap trying to kill him is a plus). With all that into consideration, I don't think he's as inconsistent as suggested and I think it's fair to just say he's 8-C rather than 9-A (I guess it's a good scaling feat for Wolverine too then).
It should also be noted that the characters that currently scale to Wolverine shouldn't necessarily be 8-C if they are kinda shown to be a bit weaker in their fights with Wolverine, since Captain America can also fight pretty well against Wolverine. Silver Samurai comes to mind as the wording on his page seems to suggest Wolverine > him, although I didn't look at the scans in detail.
Don't think there's any other physical feat by Kang, had a quick look at a respect thread and he did take a hit by Hulkling helmet down but that's an outlier I guess.