I actually had a suspicion that you had a metric dash being it only went to +4. Now we all know why hehe.
Your boost at +3 is 5.8psi
Does the boost drop off as you are throttling?
When the air comes out of the blow off valve is it coming out while accelerating or once you've backed off.
What bov is it, and i assume it is running atmospherically?
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Please use the forum to ask your questions as they will get replied to much faster than pming me 
Pics of my build.
"Good girls are just bad girls that don't get caught"
Do a diagnostic first!
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