Heyup Graham.
I'm sure Neal or James will have the answer - but in my limited experience, descending vertically, in the wash of the prop (dirty air if you like) can induce the wobbles. So far, with my 330 as it's a small quad - it does it quite badly if I come down quick. What I try to do - is fly down at an angle. A proper - prop balancer helps a lot too - is this what you have already done ?
On my 450 quad, it's no where near as bad, I think the size / weight of the phantom isn't helping. Maybe Neal or James can help with Naza settings too?
Do the Graupner props fit properly, I know I need some reducing rings for mine to get them on the 330 as they have 8mm holes that reduces to a 5mm hole, so I need 8to5mm reducing rings to get them to fit accurately.
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