Clint, heavy arrows retain their down-range velocity better than light arrows, and EFOC arrows correct faster, saving a bit of the arrow's energy usually expended in paradox correction. You'll lose NO MORE than 4 fps at 20 yards. At that amount of EFOC you can probably get great flight stabilization with a lot less feather. I'd try both 2.5" and 3" four fletch on those. The smaller feather will mean even less velocity loss at 20 yards. On similar weight EFOC arrows, with the 2.5" A&A 4-fletch I'm now using I lose only 2 fps at 20 yards.
Both very good BH choices. Your arrow setup sounds good to go; get'er done!
Ed
TGMM Family of the Bow