To consider
The normal break-in process uses a wedge of oil between the piston and sleeve to stretch the sleeve (also to a barrel shape) repeatedly until it takes a set.
That is why a lot of oil and especially castor is beneficial in creating this wedge.
There is almost no wear taking place.
After breaking in a motor, mic the outside of the sleeve- even at room temperature.
Not sure how the process you are using will effect the clearances when the stretching takes place under running conditions.
Will be interesting to see the results after the motor is used on the track.
Preferably back to back with one done in the traditional manner.