found the glitching issue, need help solving it

If you are going to get a new radio, perhaps you should consider something other than FM. When we first put my buddy's 8ight together, he opted for a JR XS3 (I think) FM modulated system. I don't know what it was because we could never get rid of the glitching. He went and traded it in on a Spektrum system and all troubles went away.

Just some food for thought.