Okay, so, no luck with the 11BT11. Although swapping back and forth allowed me to double verify that the video lines and flickering were coming from that.
However. My environment has changed since I started on this. Over the weekend I finally got my home tv transmitter started. I've only got two channels up at the moment, but I decided to see what happened using that. Sure enough, it improved the audio home dramatically. So I'm going to call this done for the most part. Here's the set working where I plan to use it.
https://youtu.be/s2wph0EkvUg
There's a few odds and ends I'd like to wrap. There's a slat broken off on one of the vents in the back. I'm planning to have a replacement 3D printed. Unless someone has a spare. I'll attach a picture.
I'm also having a few issues with my transmitter. Namely, I'm noticing that any television I have hooked up where my portacolor is (this is only happening in one location at home) experiences vertical loss and bouncing periodically. Nowhere else in the house is that happening, and it's only happening on over the air transmissions.
I may start a new thread for that, but does anyone have any experience with that happening?