I cannot speak to your problems with Spectrum other than there are none being used at our field anymore.

But I will speak to the crash you describe with the Cub. First yes of course a cub an be stalled and induce a sharp departure. Any airplane can but the Cub high aspect ratio wing much more so than other aircraft of the period.

Now the solution to this is to rig in washout at the wingtips, about two degrees. in other words the angle of attack at the wingtips will be a little less than the wing roots. This allows the wing roots to stall first and the airleron will still be functional to a much higher angle of attack.

This is very easy to do to do simply by twisting and shrinking the monocoat agine. Find an experianced modeler to help this is a very simple solution.

There are other approachs also, one being to simply rig the ailerons slightly up a few degrees when the stick is at neutral

The incident as you described it sounds like the airplane was poorly set up when you took off and it simply was very out of trim, an out of trim situation that you just could not handle and you stalled and spun agine continuing to hold up. Somewhere in there you let go of the sticks and I don,t even want to go there that can in no way help.

Your prior incident with your first radio I cannot comment on other than it sounds like a brownout situation.

John