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Can you better describe the stalling at startup? It is reasonably common for unsensored brushless motors to have a bit of issue starting moving from a standstill, commonly referred to as "cogging". Try giving it only enough throttle to have it spin and then going wide open and see if that makes a difference.
The high rpm stuff may very well be an ESC issue, but don't be too mad if the low rpm isn't any different.
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