I also shoot a Glock 34 g4 with kkm barrel that I had Magnaported plus an 11 port SJC compensator and a SJC frame mounted optic, It shoots nice and level. However, I shoot precision Delta 115gr with 10.6gr of Major Pistol from Shooters World at 1.150 oal seems to be the best groups with PF 173. It has tons of gas and extremely clean burning. I also use from time to time Vihtavuori 3N38 9.1gr at 1.160 for PF 171. I also use the Lab Radar otherwise it would be very dangerous to shoot at these levels not knowing your velocities. Therefore, I also invested in Quickload inorder to get the rest of the story about pressures, muzzle gas force, recoil, ballistic efficacy etc before you select a powder and after as well. I also recommend for you to shoot your range brass after you sort them by head stamp, time consuming but worth it for matches.