Okay guys, I am starting to get tired of this... Here is what is going on...

2001 Audi A4 1.8tqm - 111,000 miles
Stock turbo
GIAC X
710N DV
New MAF
New O2 sensors
New cat
New plugs gapped to .028"
New coil packs

I am not boosting what I feel that I should... I peak at 15 psi and drop to 10 by 3200 rpm and start to drop to 5 by redline. Never used to do this but lately has gotten worse. It also hesitates from 3800 to 4200 rpm. I have no codes. Just did a boost leak test up to 30 psi and no leaks... MAF readings are good as are 02 readings... Good compression; 170 across the board... Isn't bad gas as it has been happening for months...

Also, when I was doing the leak test this morning, I took off the puck valve and a LOT of water came gushing out... I don't do short drives nor am I leaking/loosing any coolant... It was pure water... Sort of foamed up with a milky white sludge... I also have no sludge issues as my oil pressure is 20 at idle... What is going on with my beast?! I just cannot find the problem! Any ideas of what to look at?!