I need advice on how to solve a problem with my 1988 760 w/B230FT, automatic; 190,000 miles -

For about 3 months, I have been trying to get this car back up to par. Stopping the oil leaks is my major concern. I replaced the turbo, performanced improved significantly - still rear main seal appears to be leaking at highway speeds. I replaced all three front seals. I have been determined to reduce crankcase pressure before tackling the rear main. I have cleaned all hoses, fittings, the breather box - still too much crankcase pressure.

Is it likely that rings are worn causing this problem? If the pcv system is not clogged, what other than worn rings can cause excessive crankcase pressure?

History:

Approx. 2 years, 50,000 miles ago I purchased this car with a warped head - overheated. I had the head re-worked and had good service from this car for the next 40,000 miles. (I change the oil and filter on 3,000 mile intervals.) Then, I gave this car to my daughter to drive. A few times, I have had to add 2 quarts of oil when I checked it. I'm guessing that the rings could have experienced excessive wear if it was starved for oil.

This car still has good power making me wonder how the rings can be worn causing excessive crankcase pressure.

Is it possible for a rebuilt head on a 140,000 mile block could accelerate ring wear?

The last time I did it; a dry compression test yeilded 150 pounds, + or - 10 pounds on each cylinder.

What can I do to be sure I need to re-ring this engine?

Thanks in advance for your help and advice.