I have my transponder mounted on top of the receiver box. I'm running stick packs. I have only noticed it miss a reading one time in about 10 hours of driving.
Sounds like the folks having problems are mounting around the Rx box. Do you have a telemetry system? I wonder if it's the Rx that is causing the interference instead of the chassis, or maybe the Al chassis adds just a bit more making the diffrence?
Also good point about the glitch buster, the extra weight could be causing the servo to pull more power in the turns making the transponder weak.
I mount mine where the brace would mount on the front.