What length barrel are you using?
In the experience of myself and a few friends, stay far away from the SAP unless you have an edgu cylinder. WASP is awesome, but I personally run an SCW piston.
I believe it's a 430mm. It is a JG pro. Specs below. Thanks.
-Maple Leaf Crazy Jet Barrel System (GBB, VSR, AEG)
-Action Army Zero Trigger VSR-10
-Action Army VSR-10 Hop Up Chamber
-Action Army VSR-10 M150 Spring
-Action Army VSR-10 Cylinder Kit
-Action Army VSR-10 Barrel Spacer
-Maple Leaf Autobot 70°Hop Up Bucking VSR/GBB
-Maple Leaf Omega Hopup Tensioner Nub
-Action Army VSR-10 Spring Guide
-Tokyo Marui VSR-10 30-Round Magazine
-0.40g HPA Bio BB's