Intermittent crankcase pressure issues

In the first picture of the machined block the cylinders looked polished. Couldn’t see any cross hatch. Ring seal.

A bit of a ridge is visible too, to the OP can you catch a fingernail on the ridge at the top of the cylinders?

Not trying to be a d**k but flawless cylinder walls have clear cross-hatching (directional scratches) evenly on their entire surface; worn cylinders are shiny and smooth.