Once I light it with a match, it seems to be fine. Goes from high to low, no problem. I am going to remove the top again today, and will check for junk around the burner, but am not aware of any problem. One other thought I have is to take the new harness and the old harness, and cut out the switch for the one bad burner and replace it with one of the good switches off the old harness. The only reason I replaced the harness to begin with was that the microswitch for one of the burners would not cause the igniter to work. So, now with the new harness, that burner works fine, but a different burner is screwed up.
I have the connectors and a crimping tool, but am sort of thinking that this is too new a cooktop for me to start 'Mickey Mousing'. . . .