VA,

If you are grouping "OK" at different ranges your probably fine depending on the arrows speed. I like to shoot a bit heavier than your setup, but have dipped lower with good success. You might try a heavier broadhead if your arrowspine will allow, and if everything works out you will probably have a better FOC overall.

See the other debate thread thats going on now, it gets a bit techie but thats how we learn.