well from what i have read haircut the fin makers agree with you.

that and you can do the flicky spinny stuff i'm going to listen, plus the guy at surfx also made the same comments as yourself.
choco fins recomend the royal flush (wider bigger tip) for lakes and early planing and the starfish (thinner smaller tip) for radical freestyle. i think those 2 fins show the diferences very well.
that said i have a **** load of fins and i still can't sail any better than i used to.

just counted them. and i should point out i do use all of them plus i like 1 fin per sail.
formuladeep tuttle - 70cm deb custom, 70cm gsport formula, 67cm C3
slalom/racetuttle - 48cm MFC RC, 42cm MFC RC, 39cm torquay world cup slalom, 32cm Torquay race slalom
us box - 30cm Hi-Tech race extreme
freewavepowerbox - 32cm MFC freewave
us box - 30cm MFC freewave
wavepowerbox - 25cm select x1 evo
us box - 25cm torquay slot wave
freestylepowerbox - 25cm freestyle pro (lost

)
getting 2 more freestyle fins and prob another wave fin.