Help with a miss and voltage drop

Great ideas. Keep em coming. When I switched to HEI, put ignition on relay. I think all my wiring is new. Also have relay on the HEI. Also done the MAD bypass. Cap and Rotor are the Blue Streak stuff. All good.
I just tried a new eCoil, and it made no difference. I can now try a new ICM, but of course I don't have any Thermal paste laying around, so Had to order some.