Say you make a Leap Attack with Shock Trooper and a two-handed weapon, taking -5 to attack and assigning the full penalty to AC instead. That’s +2 attack, +15 damage, and -7 AC. You also use Karmic Strike, so your total AC penalty is -11.
Now it’s an enemy’s turn. It seems like they should have an extra +11 to hit you, so there’s a good chance they do, provoking your attack of opportunity. I see no reason that you’d keep the charge attack bonus, so you swing with your normal attack modifiers. If this attack of opportunity lands, do you get +15 power attack damage?