RE: Small Fletchings?
I've only seen the dainty ones on terget setups, myself.
I want all the forgiveness I can get in a hunting situation, and I'll never use less than 4" for that.
For target competition when money is on the line, I'd be using whatever gave me the best groups and flattest trajectory, no doubt.
Definitely wouldn't try the little ones with fixed blades for hunting while releasing with fingers.