Hey, Ive been noticing that I usually get only full boost in my higher RPM range while WOT. It'll be short a few blocks and work its way up in the end of each gear.

Ive tried moving my BBV back to its original position and it made my boost a little worse. So I set it back, to the BBV mod. Not all the way though.
Ive checked for vacuum leaks and replaced a lot of my vacuum lines over the year, so they are all good.

About 2 months ago, my Idler pulley was making a lot of noise and actually ended up shredding off and the belt of course fell off too, the belt was in good condition still so I reused it after I installed my new pulley. Could the problem be the belt?

I have a scheduled tune on the 21st and would like to figure this out before the tuning date.

Is there suggestions that can point me in the right direction to find this problem.

Thanks.