Pilot bushing woes

Trying to find out what could be causing this mess. Everything was within spec when the tranny was rebuilt (preload,endplay). Is it just launching at almost 6k beating this thing up and I should switch to the roller bearing (just installed one today while I wait for the clutch)? Should also be noted i did NOT change the tailshaft bushing. Could too play on the driveshaft be my issue here? There is only the slightest bit of play there and truthfully i can feel this on most of the cars I work on. Any input is greatly appreciated.
Thanks,
Pat


