Steve, thanks for the explanation.
Started the car this morning and got a duty cycle hovering around 48.3% as it warmed up. Idle was fairly rough and emissions looks smokey (white smoke).
When it hit ~60C, I revved it a bit to get the temp up to the typical operating temp of 80C. Duty cycle went to around 92.3% and stayed there for a few minutes until I finally shut it off.
I backed off the mixture a 1/16 of a turn in an attempt to get to 45% duty cycle. The car wouldn't turn over (too lean?), so I turned the mixture back to its original position and then it started right up. Duty cycle was still hovering at around 92.3%.
What am I doing wrong?