self loosening nuts on Y6 DIY kit - reverse motors?

Hi everybody, I've just put together a Y6 DIY kit and when testing the motors(no propellers on) on the first spin of the motors all nuts flew off their shafts. The motors are placed correctly and there are not cw or ccw shafts difference. They just counter rotate because they are upside down.

I was wondering if anybody tried reversing all the motors so that the rotation would self tighten the nuts instead of self loosening them. In that case I was thinking that I should also reverse the order of the servo wires so that pixhawk still thinks that the motor that was supposed to be rotating in one direction is actually rotating in that direction. The only difference would be that the motor that the pixhawk thinks is on the top is now on the bottom.

Just tightening them well and adding some threadlock makes me really nervous, as at any minor loosening, the nuts and propellers would fly off

Any other suggestion, idea, experience or advice would be welcomed :-)

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