Thanks for all the great input, guys!
I got the wheels back on yesterday afternoon and was then able to roll the Dominator out of the hangar and work on the engine. I cranked it up to be sure the problem was still there and it was. So I fiddled with the entichenment levers to make sure they were fully closed, which they were, ran the engine again with no change. I had heard the same suggestion Doug made, and ran the engine at 3200 RPM for 2-3 minutes, then shut it down and pulled a plug from each cylinder and they both had that nice brownish tan color. So then I switched the EGT probes between cylinders. This took a little time, since the probes were reluctant to be removed, especially the probe on cylinder #2, which was the one showing the low EGT's on the EIS. But once completed, cranked it up, and low and behold, everything looked great! Both EGT numbers remained within a few degrees of each other, right up to 4200 RPM and 1000 degrees EGT. Is it possible that the probe on the rear cylinder (#2) had some carbon buildup that was interfering with an accurate reading? In any case, the EGT numbers match up nicely again, as they had before.
My father taught me many decades ago, that you could often fix most anything by taking it completely apart, and carefully putting it back together again. I watched him do this many times and have done the same myself. Of course, this was far from a complete disassembly, but removing and re-installing the probes appears to have solved the problem.
Thanks for the many suggestions. Dave, the carb balancing tool is not expensive and it would probably be a great addition to my toolkit. My two hangar mates also have Rotax two strokes and we share our tools, so one of these would cover all of us.
BTW, I decided to have the local lawnmower shop install tubes on my tubeless tires ($13 each) as this seemed like a good investment, based on comments I have read on the forum. Unfortunately, they chipped the paint off the edges of the wheels while removing the old tires. I am going to try and find an automotive touch up paint that best matches my royal blue color, since I have a couple of other spots that also need attention.