What I'm trying to do is run each ECU/motor setup from their own individual throttle.
My Planet T7 Tx has a twin-stick throttle in the left hand position, and I'm trying to match the stick position with the ECU/motor combination. The starboard pairing is the 'master' ECU in that its BEC is powering the Rx, and the starboard ECU has the red power lead disconnected from its RX cable.
Currently the port pairing works fine, and the starboard pairing exhibits the motor speed cut-off at around 85% of the throttle position.
If I swap the ECUs, both pairings work OK, full throttle in both directions, but the port motor runs much faster than the starboard.
This situation obtains whether I use one battery with a Y power lead, or with two batteries, one for each ECU/motor pairing.
It looks as if the signal from the starboard stick doesn't align with what the starboard ECU will accept, but the T7 doesn't have any EPA capability at all as far as I can see.