I wouldn't say that 1 maneuver is good I would say make it a class feature so that you regen
Level 1: Same as now except you only recover 2 of one type of maneuver
level 3: You take a Full Round Action and Recover 2 strikes, 2 counters, 2 boosts, and 1 stance
Level 9: You take a full round action and recover 3 strikes, 3 counters, 3 boosts, and 1 stance
Level 15: You take a full round action and recover 4 strikes, 4 counters, 4 boosts, and 2 stances
Adaptive Style now provides a reason to stay in the class without a destroying a dip