Mine does the same thing and I can get rid of it by just adding a couple percent to the head speed and it goes away. I've learned to deal with it on the Dominator.
My low headspeed is around 50 but found the 52 percent throttle is the sweet spot.
My medium headspeed around 70 percent is bad but at 73 it's vib free and flys awesome.
My high headspeed is fine at 90 no vibe whatsoever.
I'm assuming it's a esc or the stock motor as I can get rid of it by simply adding a couple clicks to the throttle curve. I hope this helps.
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