Just ran your specs through the program. I'm showing good spine at a 60 pound draw weight and using 100 grain tips. However, your FOC is lacking, yours is 7.5%. Nothing you can really do about that. You really need to have the 340's to have that "perfect arrow."

I'm assuming you have the 60/70 pound limbs since you're at 64 pounds? Some 50/60 bows (maxed out) can be 4 or so pounds over.