could just be the chrono... I know the peep sight tubing and various other things added can slow a string down. You arrows arent hitting anything are they?

My Hoyt Vectrix at 60 pounds(29draw) shoots 268 with a 388(Gold tip XT hunter)grain arrow.. it only shoots 253 with a 420grain one though.

you can go to shorter arrows to help speed, but speed isnt always better.. I like hitting what im shooting at smoothly