Beads?
I have two Brison 3.2's with the rubber caps & have never had any glitches.I've seen other Brison 3.2's with the rubber caps - no glitches.If these caps cause rf, Brison wouldn't use them & neither would anybody else.Could be the rx ....I'd try another one & then do a proper range check(engine running-at all throttle settings,antenna down,walk away) before taking off.
Any way, what the heck are ferrite beads???? I have seen ALOT of gassers & have not heard anybody using ferrite beads.