Guys I am helping a friend get a new Judge set-up. It is a 60lber with a 28" DL. Right out of the box maxed out at 64lbs. It shot a 415gr arrow at 270fps, this was with a 19gr peep and a string loop installed. About how much more can we squeak out of it, I think it is pretty close now, but I bet maybe 5-7fps left in there.
PS- The 415gr arrows are what he is using so base your estimates on that.