Kohler Command 25hp burning oil

I have a 1997 Craftsman 50" riding mower with a Kohler Command CV25S 25 hp and it's burning oil bad enough to foul one of the plugs in less than an hour of mowing. It has just under 600 hours on the clock. Compression seems really good with just over 180 psi on the affected side and a little over 200 psi on the good side when warmed up. It's burning oil on the side with the breather on the valve cover. The breather doesn't seem to be plugged. I've read here somewhere that the reed valve could be a culprit but I only have side that burns oil. I had to replace a the valve stem seals on one of the heads before at around 100 hours but I don't remember which side. It seemed to have fouled a little differently that time.
I would really appreciate some help to point me in the right direction this time around.
Thanks in advance.

Kohler Command 25hp burning oil