Is there anything (barring motor thrust axes being misaligned) that would cause an opposing pair of motors to overheat? I'm guessing my quad is fighting yaw because of opposing pair part. Navigation looks fine so I don't think its a gyro or compass drift or something like that.
I've done auto APM 2.5 ESC calibration (https://code.google.com/p/arducopter/wiki/AC2_ESC) and the only deviation from the procedure was I had to drop the throttle in order to get the 2 beeps in step 5 (as opposed to waiting for 2 beeps to drop the throttle). I waited for 2 minutes and they never beeped twice unless I drop the throttle first. Am I misunderstanding the procedure?