Based on that, the scaling comparison looks like this, I think:
1.7 Megs<<<Stat Amped Zoro<<<Damage Boost Zoro
Raphtalia defeated someone who could beat the Spirit Tortoise by themselves while she was heavily nerfed. As she was only at 1/3 of her base strength, couldn't use weapon enhancements, and wasn't blessed.
^And as a novel reader, I can't stress enough just how much that nerfs her.
There's literally a one-shot difference between someone with 1 weapon enhancement method vs someone with 3 weapon enhancement methods (Even at a significantly lower level). And Raphtalia literally has at least 4 by this point (None of which she could use in her fight where she was also nerfed)
1.4 Megs<Nerfed Raphtalia (No Weapon Enhancements)<<<4.2 Megs = Base Raphtalia (No Weapon Enhancements) <<< Base Raphtalia (Weapon Enhancements) < Combo String Raphtalia
If you remember the end of the anime where Naofumi and co. were fighting on those ships, the reason why Naofumi could fight against L'arc and Glass while the other heroes got one-shot is literally because of Weapon enhancement methods. It's not explained as thoroughly in the anime, though.