Update: ended up splitting coil power into 2 circuits, leading/trailing, with independent feeds/fuses/switches, now can check ignition on A & B ECU rather than just B as per EC2 wiring. Also cleaned up a bit more wiring as I had inadvertently created a ground loop on my radio to efis serial cable by connecting the shield to ground at both ends by mistake. Radio works better but now an old problem has returned that I thought I had fixed as Tracy had years ago, given instructions on installing some part to the circuit board, when I transmit on radio the engine misses, think the injectors are going full open and flooding engine again. seems to only happen in flight which has got me buggered as the engine cannot know its flying.
Going to try rewiring components back to the battery. as now I think it could be something to do with the battery being moved for CoG and components losing their independent feeds & ground back to the battery.