Adding weight to carbons

[starshooter]

I know this has been kicked around a lot but
I have been trying out the GT Entrada 600 & 700 s . The 600 flies well and the
700 Is I almost as good. I inserted 27" of weeder string hoping to add weight to
5.4 GPI 0f that arrow. Can any one tell me roughly the grain weight of the string?
Both arrows are 28" tipped with 125 target points. The bow is upgraded with 35# limbs and I am drawing 27" ( 32 1/2 pounds) three under release. I am fully aware of good back tension which has become the cornerstone of any evaluation I make on my shooting. So operator errors are always a possibility. That being said I am wondering if the 700 which is a smaller diameter be improved with added weight. Thanks for your help .