Originally Posted by DeliveryValve

The valve slap would concern me. Before going further, I would definitely check piston protrusion height in all the cylinders to determine if there is a bent rod.

The other thing that concerns me is the cylinder bore scratch even though you stated you can't feel it. It could be caused by carbon debris, in which you can probably leave it. But if it is ring related, you'll have issues later on. I would seriously consider removing the piston and inspect it. But if you do one, I'd do them all.