Set everything to Factory Fast...most likely someone hasnt set CON time high enough...unless, you mean with Eye on, in which case, increase your cocking pressure via your LPR...you shoudlnt need to adjust the back block..if its ben working in the past.
Put teh gun in Classic mode...hold trigger back with air, and look into teh feedneck, to see how far teh bolt is goinf back...if not..it may be, as I saifdd, taht your not using teh Eye, and your Con time is too low..so it smoving too fast for paint to drop in.