I really like the strike through mechanic and how with Improved and Greater 2 Handed Fighting, we get more stat bonuses.

But I have a few questions.

1. Power Attack and Hand and a Half weapons...do we get the x2 DMG from Power Attack? Or do we get the 2x dmg if we have the 2HF feat(s)?

2. The Epic Past Life Feat Ancient Power. The Wiki says this:
Primal Past Life Stance: +2 to Attack per stack of this past life. If you are fighting in Two Handed Fighting style, you also gain +2 Damage per stack of this past life.
Would this bonus apply to Hand and a Half weapons as well if you had the feat?

I am trying to prepare my next build(s).

Thanks for the responses!