don't get locked into a specific fletch size without some good testing.
you want a good compromise of solid steerage with lowest drag. of the two, steerage is most important.
small feathers don't steer worth a hoot.
there are many factors that will point your shooting and your bow(s) in the better direction of fletch size than just surmising what you *think* will work best for *you*.
feathers have height as well as length, and it's the sum of the surface area that counts most.
if your arrows fly well sans any steerage, don't be lulled into thinking that smaller feathers are the way to go.
consider the distance that you typically shoot at game. bigger feathers will also help with a bad release, and plan that you *will* have a bad release at least sometimes. arrows that straighten out quickest and fly truest will always yield the better results.
all my arrows sport 4-fletch, 74x105. for carbons the feathers are low profile banana cut, 4" long. for woodies, i chop a higher profile and they're 4.7" in length.
longer and lower feathers offer better arrow shelf clearance while still maintaining good steerage. higher cut feathers may just fly different and take more time to tune.
again, there is much value in doing yer own feather flight testing, don't just assume what you think will work best, will. 'cause it probably won't.