ESC endpoints for sure. If it's just a tiny bit more, then it's just your trims that need adjusting.
As for setting the ESC endpoints, you might have issues when using Spektrum receivers as they take a lot of time to bind.
This is how I did my ESC endpoint calibration:
Take off the props. Unplug M1 servo cable. Plug in the battery. 2 ESC's should arm, the unplugged one should not arm. Arm the board and raise throttle, motors 2 and three should spin up. Plug in M1, it should go beep beep, then turn throttle down, and it should arm. Unplug the battery.
Repeat the process for M2 and M3.
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You might wonder why the yaw motor tilts to the side when you throttle up, this is normal and is to correct the torque from the props.