One thing I have done is use the string material to accomidate my arrows. For example I was too stiff with B-50 and 2016 arrows with one bow, but as soon as got Chad to make me a 450+, now the 2016's are weak, in fact, I now shoot 2018's with 145gr tips on that bow.

I like the 450+ cause I don't have to worry about strtch.