Replace your
oil filter, if your lucky most of what got ground off in the pump should be in it. If your down to 25lb in one cylinder most of the unburnt fuel in that cyl will be diluting your
oil as well. I dont mean this in an unkind manner, but with all the time you have spent on these issues you could probably fitted a new set of rings. Sometimes the long way is the short way!
Jac Mac