Think I'll try StereoTool to see if it is better than the spartan integrated processing in RadioDJ. I'm only using the AGC control there and passing the peak limiting to the Behringer.
An aside...
Why do we want to transmit AM to our yard and home?
Well, for me, it's something odd. I have a veritable plethora of 70's music of all genres. A lot comes from the inevitable Time/Life series. In fact, I have a "TL" format on RadioDJ for this AM station. All Time/Life, all the time. Why???
All of this music, for me, was listened to via AM radio. During the majority of the 70's I was in an area that wasn't served by any listenable FM station, so everything was AM Top 40 from local and at night, distant stations. I have a certain affinity for the sound of AM radio. That's it. Carole King or Jethro Tull hit music sounds weird in pristine, clear, digital audio. I know it from AM. And I like it that way.