feathers give "stronger flaps" : doesn't work

Last night I tried out making feather collection give the player and enemies stronger flaps. I failed.

In the player's case, there seems to be no utility to stronger flaps. Flaps which are too weak mean the player has to flap like crazy to stay aloft. Flaps which are too strong make the player hard to control - you overshoot a lot. Playing either way is annoying, and it seems bad to make the player have to contend with either of these circumstances.

Also, changing enemy flap power made the rudimentary AI harder to tune and get right, with no actual payoff.

So I'm thinking of scrapping variable strength flaps. Collecting feathers gives the player points (with flashy combos, I hope), and gives the enemies more smarts (I hope)