Summoner Natural Attacks and Power Attack

[Aranai]

We ran into a bit of grey area last night. I took the Evolution that grants me Strength x1.5 on a bite attack, and I also have Power Attack. Does Bite benefit from the increased attack penalty/damage bonus ratio as two-handed weapons? Or does it still only benefit from the standard power attack numbers?

[Lune]

Power Attack wrote:

Benefit: You can choose to take a –1 penalty on all melee attack rolls and combat maneuver checks to gain a +2 bonus on all melee damage rolls. This bonus to damage is increased by half (+50%) if you are making an attack with a two-handed weapon, a one handed weapon using two hands, or a primary natural weapon that adds 1-1/2 times your Strength modifier on damage rolls. This bonus to damage is halved (–50%) if you are making an attack with an off-hand weapon or secondary natural weapon.

Since your bite does 1.5x Str then it benefits from the +50% per the text of Power Attack.