"Basically the reason it does this is because as you are descending, one of your propellers stalls while at low RPM and as that side drop, it tries to compensate and ends of stalling the other side and so in, inducing the oscillation. I have also…"

"I found with my Y6 the only thing that helps is going to smaller props at higher RPMs. Also, some forward movement helps prevent the oscillation as you descend."

"What motors, props, and payload?"

"I prefer collets, but depending on what size helicopter it is you my be able to get away with the prop savers."