RC motor oscillation problem

[mlt34]

Here's an interesting problem: my RC motor setup is causing weird oscillations as I near 3200 RPM and then if given enough throttle it will jump to 4000 RPM after a bit of oscillation. It's a little hard to explain in words but here's the short video clip showing my motor behavior with RPM reference:

http://youtu.be/M5-pZlxDVfc

Here are the specs
Motor: N6354 outrunner motor 200 KV
Voltage: tested on 24, 30 and 36 volts (same behavior at all three voltages),
Controller: 6 FET 3077 Mark II Mini Monster LYEN Edition Controller
Throttle: Hall effect sensor twist throttle
Hall sensors: my own hall sensor adapter in the video (to the left of the motor) but now I'm running gwhy!'s adapter and the problem remains unchanged. I've also timed the sensor adapter for lowest current so I don't think its the hall sensor adapter, especially since it occurs whether I use my adapter or gwhy!'s adapter.

I then swapped the controller out for a 36V KU-65 and that solved the problem of the 3200-4000 RPM window being unusable, but that controller is very limiting so I want to figure out why my 3077 Lyen controller is giving me that odd problem and solve it. Any guidance from the years of collective experience you all have would be much appreciated!

[gwhy!]

The only thing I can think of is it may be to do with the throttle, ( the same throttle can behave differently on different controllers ) , may be worth trying a 5k pot just to test.

[mlt34]

What do you think the odds are that that's the problem? It just seems strange to me that it would work with one controller yet give a problem over a specific RPM range on another controller.

[gwhy!]

its not very likely but really easy to test with a normal 5k'ish pot( this is what i use when testing and setting up a controllers/hall sensors ), It could be something really funky going on with the controller , it may be fine with another same make controller