1987 Rebel 250
That cylinder that's at 115 dry had the exhaust disconnected for years (by PO), so I assumed that since the psi remained low even after adding oil to the cylinder, that it just be more than the rings leaking, and that's it's probable (given the above) that the exhaust valve could be burnt. I'll be happy if I'm wrong. I really don't want to replace valves.I really doubt the valves are burnt.. Don't know why you feel they are without proof..
There are Used and New P&C sets for sale on eBay which will likely solve your compression problems.
Partzilla has the gen1 and gen2 cylinders as different part numbers, so I thought those eBay kits wouldn't work. I was even thinking about going with the 280cc, but that seems like a gen2 part as well. I guess I could swap the top end to gen2 and that would work.
I'm very open to suggestions. Called tons of shops, and no one is willing to touch my bike......