[tsubaki]

I don't remember testing mine so I'm no help.
From what I remember wide open throttle is the only correct way to get a reliable reading.
Remember my Father telling me he picked up an engine for parts. The guy he bought it from said it ran like crap and had low compression, basically burned up. A good while later Daddy cleaned the carbs, done a compression test and it ran as good as any he had ever owned. He later ran across the guy he got the motor from and questioned him on the low compression. The guy did the test in the idle position.

Is it possible the side with the lower compression might be head gasket related or the like?