Ok, I see the problem then. I looked over the spells and powers available for 1st, 4th, and 6th level abilities (the equivalent levels) and realized these were definitely lacking. How about this, then

Level 1:
Savagery I (Ex): As an Immediate action, you may spend 1 Beast Point and make a DC 15 Combative check to add +1d4 damage to your next successful attack with your natural weapons. You gain an additional +1d4 for each 5 points you exceed the DC.
(no change)


Level 11:
Savagery II (Ex): (requires Savagery I) As an Immediate action, you may spend 3 Beast Points and make a DC 24 Combative check to add +2d8 damage to your next successful attack with your natural weapons. You gain an additional +2d8 for each 5 points you exceed the DC.

Level 20:
Supreme Savagery (Ex): (requires Savagery II) As an Immediate action, you may spend 5 Beast Points and make a DC 30 Combative check to add +2d10 damage to your next successful attack with your natural weapons. You gain an additional +2d10 for each 5 points you exceed the DC.