Blower pressure flutter

Has anyone had issues with a whipple where it seems to flutter boost ? If you look at mine on the graph it jumps up and down very quickly all during the run like from 44 to 38 lbs and back up in a span of 5 hundreds of a second it dosent seem to get worse as it goes and i dont think it is a sensor because if i lay my accelerometer graph next to it they look alot alike it jumps up and down very quickly also but the rpm and drive shaft do not show this pattern ? I have checked everything for leaks and all i can find is there is what seems to me to be a little more slack in the blower pulley than i think there should be any ideas

 

not knowing who's logger you are using
is it possible to change the sample rate
may need to do this so it has a better average