6.1 hydro ticking

Did you bleed them down when you swapped cams? You bleed them by poking a pick into the cups hole. They could be stuck in an in between spot of lash. Its a long shot but if you pull the rockers and check them all by pushing on each pushrod and find none that are NOT pumped up, you can bleed them all back off and let them "start-over" so to speak.