I am shooting GT expidition hunter at 29" with 100 gr. 3 blade Muzzys and 4" duravanes now. Draw weight 70lbs. I was planning on switching to pro hunters with blazers, but I want to get some opinions on my new hairbrained idea. How about a slightly heavier spined - GT ultralight 300's @29",125 gr broadheads with blazers. I just think that xt's and pro hunters are just barely enough spine , and a 300 spine would be better. And a 125 gr bh would give good total weight and f.o.c.