I'm seeing that in the 2nd video where 2 & 7 stick on (2nd crank in 2nd video). Can you isolate exactly where that is in the log?
It's hard to tell from the video how your wiring is routed but you might try separating the coil driver wiring from the input and uart wiring. You could be getting induced noise on the ground returns or driver outputs that's messing with the EST and opti inputs.
Because of the low resolution I can't tell but it looks like you might have something that could be (conductive) wire used as a loom wrapped around the bundle of wire coming off the controller. Is that the case?
Apologies if I'm missing it, but is there any video of the controller running (leds) while you're driving the two plugs side by side?
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