I have resolved a head-scratcher and posting this as a possible solution for anybody else that runs into this issue.
I have two distinct circuits on my living room lights and kitchen lights as evidenced by them being on separate breakers. I had all LED lights (8 BR30s) in the living room on a GE dimmer switch. I had 7 BR30s in the kitchen (4 were LED and 3 were CFL) on a Leviton dimmer switch.
When the kitchen lights were on and living room lights were off, they kitchen lights ran fine. If I turned on the living room lights, the kitchen lights would flicker. Which makes no sense to me because they are on separate circuits. If I used smart tiles to run off the living room lights, the kitchen lights would immediately stop flickering even though there was about a 2 second lag between pressing the tile and the living room lights actually turning off.
I took the three CFLs out of the kitchen and replaced them with LEDs. I haven’t had the flicker since with both the living room lights and kitchen lights on at the same time.
My house has neutral wiring.
It really was an odd issue in my mind.