You need to pull the red wire from one of the ESC connectors into the Y harness. Right now they will create a feedback loop and cause difference in throttles that change all the time. I actually recommend that you plug each ESC into a different receiver channel and use a mix. You still will need to disconnect one of the red wires. You can unclip the lead in the plastic plug and push it out and then I usually shring wrap it back to the cable so if I want I can replace it if I use that ESC in a single motor configuration in the future.