Not a 3.5 but I picked up a box of 3" 1 3/4 oz. #5's tonight to run through a Hastings .685, Star Dot .6675 and an SSX. My 24" barrel Gold is as picky of a gun as I have ever tried to pattern. May try to find someone to swap with after season, get a 26" or a 28" pipe. I just sold a Jellyhead and Jellyhead Max, Max did best of those 2 in my gun.
A lot of folks say the Inv+ do best in the .675 range, just have to try a few and find out.