thanks for your extensive reply Paul.

more details:
50-60lb set at 60lb
27" draw length
rest: NAP quicktune 800
arrows: easton epic st with target tips (all straight) 28"

bow has been paper tuned
there is no vane contact
nothing loose on bow

i shot the bows side by side at 25yrds
justice grouped the same arrows one to two inches apart
drenalin could not get a consistent group ocassional shots would be more than 9" off. all arrows hit target straight on

the only thing i can put it to is the rest, i will be mounting a trophy ridge to the drenalin shortly as i am awaiting its arival. then if it doesn't help, the next step is to take it in to a pro shop.

i hope this will be resolved as i love the design on the bow, the smoth draw and how little it weighs. i also have a new black ice that i need set up which i can play with in the meantime.