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It looks to me a problem with the connection. It would be better to diagnose if the wiring was as direct as possible. Making various adapter cables is an important project. I would not use the detour to the transmitter even if it isn't plugged in, it could act as an antenna for hum. just clip the wires end to end. None of the RF controls should effect the AF output. I've replaced the AF connectors with RCA (phono) connectors on my SG-8. I'm very busy today or I would check some things myself.
The probe adapter for that USB scope may have a 10X attenuator that will increase the max voltage you can look at.
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