Lots of things can be done to a stereo mix to enhance the sound. This is basically the mastering process. It's mostly all EQ and compression like you've already got going. A stereo mic setup should sound good hard panned 100%. Get a VST mastering plugin, izotope ozone is a very fully featured one, with lots of presets to get you started. Multiband Compression, Harmonic exciter, 2 parametric EQs, stereo widener, reverb, and Maximization are all extremely useful for bringing out the best from a stereo mix.