Since you are using stepped RN, consider this. Stepped RN bullets have shorter bearing surface than CN/SWC bullets. While they can be loaded to longer OAL than 1.125" to reliably feed/cycle in many pistols, I often use 1.125" OAL which seem to seat the bearing surface deep enough in the case neck to produce more consistent initial chamber pressures.
This not only allows me to use less powder but also experience greater accuracy.
Of course, ultimately you should let the holes on target be the judge. If your barrel/pistol works with longer OAL, range test different OAL loads and use the OAL that produces greater accuracy.