so I looked at your #'s on page 1 and it looks like you did do a dry and wet test, looks like the #'s were low on #3 and #5. If it were me and I could identify problems with the valves on #3 and #5 I would assume and take an educated guess that the issues are arising from these valves not the bottom of the engine. If it were me and I could identify valve issues with 3 and 5 cylinders I would take the risk to clean up the bottom engine and have a a good used head rebuild and slap it in with a new headgasket.
That's my take on it, hope that helps. I may be way off and hopefully others that are smarter than me will chime in with their opinions. Post some pics of the valves, would be interested to see.
good luck, Noah