I'm looking to build a high foc arrow. I'm currently shooting a hoyt vector 32 at 28.5 dl and 70lbs dw. I'd like to use a Victory RIP shafts with a 56gr SS half out or 50gr brass hit. I currently shoot a 27inch shafts but could drop at least a half inch especially if I go with the half out. What would be the better spine option for this set up 300 or 350. I've ran both shafts in a foc calculator and they come out between 15 and 17 percent. Thanks in advance for the help.