Deadzone for alt-hold issue

When I go into alt hold mode from a hover state, I am only a few millimeters away from the top of the throttle 'dead zone' which controls the height of the alt-hold.

The problem is if I am giving it a little more throttle than usual and then go into a

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Not enough power to takeoff

When I slowly ramp my quad up to full throttle i can just have it there maxed and it doesn't take off.  But then I reduce throttle to zero for a few seconds and it takes off fine after giving it throttle again.

Is this a setting somewhere or could it

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