You are lucky to have yours going as well as it sounds. Don't get me wrong; I have heard that they are outstanding performers. I just had bad luck with my 24" Space Command. Never got anything but volume adjustable hum for sound and almost no vertical sweep after a complete recap. It was likely a couple of separate problems outside of resistors and capacitors. It had to be really, but I lost interest after all of the work on what looked like an almost unused chassis with all stock tubes. I thought it would be a cinch due to that aspect alone. I do remember finding an open coil and diode in the video detector circuit, but I was pretty much done by then.
I tried to find a home for the set, but found no takers. So I have a complete chassis you could eat off of, and all the remote stuff, tuner too if you need anything. That should be a good candidate for a regular use set if you treat it right!
Oh, BTW there is a "buzz control" on the back of that chassis or should be. Have you tweaked that any?