Continuing the discussion from EVCS constantly falling off wifi:
I dialed TX power from 22 to 10 dBm, that seems to have stabilised it. For now. Also am on 20MHz and changed to channel 6 (from 1). Did not find a setting called Fairness anywhere so left that out.
I started with 4dBm, that connected to the EVCS but cut out my monitors (two redundant iPhones) so I raised it to 10.
Early to have definite results but the main thing seems to be the EVCS is not dropping the WiFi as it did before.
Will continue watching and possibly tweaking a bit more but it looks very promising so far. Just calling in to thank you for those pointers.