By the way, I've also tried an SME 309 and IV, but didn't like the SME sound.
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I'm guessing that what he likes about the 4 is it's nimbleness and tight, pristine clarity while still managing to be full enough to resemble reality. Those other arms sound bigger and bolder, but may lack the 4's charm. I moved from the UP4 to a Well Tempered Reference (on a Well Temp. table) and feel like I am getting the best of both worlds. Would always recommend the 4 for any other compatible table however. Dhcod, you may want to stay right where you are and look elsewhere to improve your analog sound.
Just a suggestion, but do you know anyone who bought a Fozgometer that you can borrow? It's an expensive toy for a one time adjustment, but setting your azimuth correctly may bring back the extra body you feel you are missing.
Another suggestion that shouldn't cost much is table resonance control. Try dampening vs undamening your plinth and/or platter, or perhaps trying a different method of isolation under the turntable, like a Ginko cloud clone using a butcher block with about 8-10 squash balls between it and your shelf.
Less expensive options than replacing a cartridge, or a phono stage or a table itself and they may give you what you are looking for.