Td04 and the difference is very noticeable weather your mapped or not granted I am mapped to a bar but adzzzz123 is un-mapped and running .6 I believe and his motor shifts well really well intact so I would say there is a noticeable difference
Have u checked your fan is kicking in , it could the fan or the fan switch that's not working , have u tried to bleed the system check if its got an air lock ?
Either that or the actuator could be sticking mate mine did that and it wouldn't hit full boost till later on in the revs just try whipping it off n giving it a good clean and check it moves freely