Well, it sounds like your tuner benefitted from cleaning. I love simple solutions.
If you are getting a strong clear picture with good colors, you may be near the declare-victory point. Some bits in old color roundies are better left alone unless you have a very specific reason.
I was one of those folks using rec.antiques.radio+phono 20 years ago, as well. Learned many things from that group, although I drifted away after web-based forums became more active.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html