Oh, one good thing came out of this frustration. Most of the bulbs I had tried had some flicker when running at <100% brightness or a periodic "flick" when running at 100% brightness. I was about to install capacitators sold by Insteon to maintain a constant load on the switch, and, theoritcally, solve the problem.
But, at the last moment, I was pointed to Murray Feit BR30 bulbs with variable Kelvin temperatures (switch on the bulb) and different flood diameters on the PAR30 bulb (again a switch on the bulb). They worked - essentially no flicker/flick and smooth 10%-100% brightening.
Yippee!!!!