Please may I ask.....

I have stripped and rebuilding a 0.22 BSA Superstar Carbine, being a bit harsh and boingy with its original spring I have completed the following:
Discarded the original spring guide and turned a delrin replacement along with top hat.
Using a Titan No.1 with 31 coils, I initially removed two coils, carefully lubricated, assembled and tested, running a bit hot.
Removed another coil, ran hotter!
Removed another coil (down to 27) still a bit hot, but, not consistent velocity. Maybe, could this be due to lubrication/grease pattern before settling? No detonation evident....
Before committing further surgery on the spring, how many pellets should I put through it to stabilise lubrication/grease pattern if that is the cause.

All be it, the harshness has gone, smooth cocking....

I appreciate any help, or advise, and apologise if I am late in response to reply in kind.

All the best to all....