Buckeye - Sorry if this just complicates your decision. My belief is that typical results for your setup would show the Heritage 150s as too weak. Many variables affect your results, this includes, tip weight, insert weight, fletch type, wraps / cresting or not, and your release form / style... I shoot the Heritage 150s with the following setup. Old School Black Widow HS 60 Recurve 52lbs@28", with B50 Dacron String, 27.75"Draw, 28.5" Arrow Length, 50Grain Inserts, 125Grain Tips, Double Wraps w/3-5" Fletch... I am tuned really well but I'm closer to the edge of slightly weak than stiff. The wraps I have stiffen things up and if I went lighter on the tip FOC would start to enter the not very forgiving side. If I didn't have double wraps - too weak, etc.. With you adding 1-1/2 inch to your arrow length, slightly longer power stroke, & Fast Flight string I think you're on the edge. I'd recommend buying one 150 & one 250 as "tuning" shafts and bareshaft tune to determine your requirements, then go full bore... This way you can configure your length, weight, FOC, inserts, tips, etc.. I believe money well spent all things considered. I'd be happy to answer any specific questions.