So do you have a small chamfer at the top of your bore??

That and the fact that pistons are smaller diameter in the ring land area than the bottom of the skirts creates a situation where some of the small rail oil rings will pop out of the ring compressoras they go below it and expand enough that they won't go into the cylinder.
also where the wind up type compressors overlap they will also be an extra area of wider gap where the ends of the oil rails will jump out----being careful with the clocking of the rails and where the lap of the compressor gap is can help--but IF you do have a champer at the top of bore you are pretty much hosed!!!!!!!!!!