please help...bad cogging

[Finnster]

The other thing I may check is to see if there are any broken connections to the capacitors, as they seem prone to breakage on the 9920. Obviously your problem is tied to heavy loads on the controller, and there only so many things that would cause that.

Edit: Had another thought... sometimes I got cogging when running a ubec even w/ an FM radio. The DSM radios are the only ones that ensure smooth operation. Have you tried using a RX pack in place just to check this out? What radio