Bought a full size HK VP9 to match my VP9SK. I shoot well the SK but the full size always goes low. Only difference is factory truglo on full-size and of course size. Using fmj 115gr also. Any suggestions or thoughts are great and appreciated very much. Seems all my ccw guns I shoot fine just having difficulty with full size. The PPS is spot on too and its got Trijicon Night Sites also. Is full size just harder to manipulate??