regarding value for your tuner dollar, suggest Magnum Dynalab Etude, MD100 or the new MD90, or the Fanfare. But since you like your Adcom stick with that for awhile.
In order to beef up the tonality you could try experimenting with different upgrade AC cords & interconnects. You'll be surprised at the improvements that can be realized by doing so. So many owners end up selling perfectly servicable components & moving onto something else just for failure to experiment with these basic tweaks. A better antenna is also helpful despite the fact that receive signal strength already appears to be strong.
In order to beef up the tonality you could try experimenting with different upgrade AC cords & interconnects. You'll be surprised at the improvements that can be realized by doing so. So many owners end up selling perfectly servicable components & moving onto something else just for failure to experiment with these basic tweaks. A better antenna is also helpful despite the fact that receive signal strength already appears to be strong.