Going to build some new rip tok arrows for this year's elk hunt shooting a hoyt ventum pro 33 at 31" draw have my current arrows cut at 30.5 . Will have 20 grain lighted nocks, 3 6.1gr vanes, 50grain insert, 10 grain collar , 125 gr broadhead will put be somewhere around 15% foc but trying to decide if I should go 300 or 250 spine any suggestions?