Ok sweet I'll try that. I just so happen to still have them so I'll try reflashing to beta flight to see if that works.
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It's more than likely your kiss fc. I've had two kiss fc's with the exact same issues you're experiencing. Tried new motors, esc's and a new freaking pdb but the only fix was ditching the kiss fc. My friend re flashed one of them but it still wouldn't work. When I would throttle up on the bench...