Ed...how well the valves are seating has become less important now...
They are probably seating pretty good now...which is why so much air is getting past the rings.
I know you're looking for some sign of progress to motivate you to tear into the crankcase..
We ALL get one of these engines from time to time....if it doesn't beat you..it'll make you a better mechanic.
If You Have All The Answers...Except The One You Need...You're Not Trying Hard Enough...
Do The Work