What boost gauge are you running? When did it start to happen? I would take a few steps back put the stock actuator back on for now see how it runs, yes 0.85 is fuel cut it sounds like bad boost spike you could just turn the ebc off, I would change the oil/filter give it a mini service, this might help I would suggest upgrading ecu before messing with the ebc imo check all of your intercooler pipes over and over make sure all the boost pipes are correct.