In my very limited experience I would say go with the 70-75's or 75-80's. My Shrew Scout shoots 65-70's just like Ron said it would. Mine is 55 @ 28" and I draw 27". My arrows are 28.5 BOP with 160 Treesharks.
Heh Fletcher, since these are Surewood firs does that add another 5 #'s since fir does not recover quite as fast as POC ? If so he should be right on as you and Ron said with 75-80's ? At least if he is to the high side he can leave another inch of length on them if needed. If he went with 70-75's he might get too short before he is stiff enough ? Better yet, order a test kit from someone in 65-70, 70-75, and 75-80, THEN order 3-4 dozen shafts and start making arrows or order them from Fletcher. Fine gent and even finer arrowsmith IMHO !!!