I'm wanting to try some wood arrows and plan to order a test pack from Surewood but don't know where to start. So I'm shooting two cut to center longbows; a Big Jim Buffalo and Thunderchild, one is 54@28 the other 50@28. I draw just short of 30" so I figure I'm shooting 55-60 pounds between the two, fast flite strings, need 31 inch shafts BOP, would like to shoot 150-160 grain heads. I generally require stiffer shafts than most recommend, currently shooting 340 spine Axis with 250-275 grains up front. So what would be a good starting spine for woodies? Parallel or tapered? Thanks for the help.