I just got done tuning a set of GT 3D pros myself on a Patriot. My arrow is 27" long, and I opted for 5" feathers. Overkill? Perhaps, but my goal is to shoot a single arrow that shoots 3-D and hunts equally well.

Although I haven't done so yet with this particular arrow, based on prior experience I should be able to screw in a fixed broadhead and shoot identicvally to field tips. The large fletching helps this happen.

Same as above........if its a target arrow, shoot 3 inchers........if its a combo arrow go with atleast 4 inch fletching.