Hi Funpilot,
Now that we all realize why the grass, etc. gathers towards the left rear of the mower the train of thought moves quietly along to the next step. At the lowest setting the cutting edge of the blades are 2 1/2 inches above ground, which to most people is an ideal setting. The underside of the deck is 5 inches above the ground. The front edge of the mower is 4inches above ground, the two rounded side are 2inches above ground, and the rear sloped edge is 4 1/2 inches above ground.
So to all intents and purposes the blades are more or less flailing around in mid air, that is, there is not enough suction to lift the grass for it to be cut. But don't despair completely I have a friend who loves challenges, who would like to work on my 48 inch mower, he thinks there could be an answer. We've worked together before so I am very hopeful. Meanwhile I'm surprised that someone didn't mention to you about running full throttle for the benefit of the PTO.
I hope I will be back eventually with news, either way.
True PT'ers never give up without a darned good try.