If I take mythic guided hand or mythic weapon finesse on a Two-Handed Fighter, does overhand chop deal double wisdom/dexterity bonus damage with the appropriate weapons?
I'd like to say you're just substituting the other ability score for Str (so yes you get double Wis/Dex), but this FAQ says that unchained rogue finesse training doesn't work that way (specifically referencing overhand chop), so these might not either. Ask your GM and expect table variation.
Yep. Unless an effect says otherwise (as does the agile quality, for instance), it's a straight substitution. (Thus, the unchained rogue lets you get 1.5x your Dex with an elven curve blade; Elven Battle Focus lets you add 1.5x your Int.)
It depends on whether the unchained rogue FAQ is the precedent or the exception. I'd lean towards it being an exception, and that you would get x2 wis/dex on the first attack with the mythic feats, but that's just my opinion.
I came here with the same question, so... is it x1 dexterity, x1.5 or x2 with mythic finesse and overhand chop?
(And is the answer the same for dragon style / ferocity?)