I'm shooting a STI Trubore. I shot yesterday with a Sprinco in the gun. The dot was whippy and slow. I put a standard guide rod in the gun today and the dot tracked faster, but still not as fast on the return as I'd like. I can't change the comp, but I can change almost everything else. I'm shooting Montana Gold 124's, 7.8 gns VVN340. What % change will changing powder, bullet, and recoil spring make? Any suggestions?