Isn't this the way it always works. I ask for help after struggling for too long. Then I go back to the problem and notice something I had failed to notice.

Previously the sparking behavior varied a lot and I swapped out a extra old 4 igniter box I had from a previous professional repair/warantee work. That did not fix the issue so I reinstalled the 6 igniter box. The behavior changed, but the problem was still there. After more reading on this sight, the symptoms seemed to indicate a control module problem. I replaced the control module and then had this weird "paired" sparking problem.

I posted the question and returned to the stove to make sure all of the grounding looked good. While working through that, I was looking at the igniter wiring and wondered why the sequencing seemed illogical. I then started tracing control module wires to the knobs. Ah ha! I notice that the numbering was very sequencial. #1 is the LEFT front and #4 is the right front. I had swapped 1 and 4, 3 and 2. So when one of the pair ignited the opposite of the pair had to be on to sense the flame. I swapped the igniter wires and now they all work as expected.

Boy do I feel stupid. I masked a fix with a simple connector swap.

I guess it makes another symptom-fix pair that can save someone else time in the future. Even mistakes are of value to the site.