I would try adjusting the shims on the ULT trigger if it has one. Even +/- one shim can make a big difference, and it took a lot of tweaking to get my X-valved mag shooting right. Pressure also has a big effect on the RT effect of trigger, with higher pressures making the trigger re-set faster. Mine seemed to work best over 850psi, and not all pre-sets deliver that pressure reliably.