my problem is i have a very large draw length and want to minimize my arrow weight as much as possible.

Parker bow, 31" & 68#.

i currently use carbon express terminator lites and i think they are just a hair underspine..... so i am looking to get the lightest weight arrow and still be spined well.... i have been looking at maxima hunter 350's, but i want to make sure they would not be underspined.