Well, the Shelter 501 is not "zippy or buzzy" so I don't think that is your problem, although you may want to check that the VTA is just a hair lower at the pivot end of the arm, and the loading is set at about 100 ohms. The OL arm is remarkably uncolored, so that shouldn't be a problem either. The Michell table is a good one, not the very best, but certainly capable. You should be getting good results, and it seems that you are, considering that you feel it is better than CD sound in general. I think you may be able to tweak it in better than you have it now.
Also, regarding Pbb's statement, it is naturally an incremental difference and you can only expect differences in certain areas, and these will vary based on the quality of the recording, as you noticed.
Give it some time, and see what you think in the long run.
Also, regarding Pbb's statement, it is naturally an incremental difference and you can only expect differences in certain areas, and these will vary based on the quality of the recording, as you noticed.
Give it some time, and see what you think in the long run.