Not a fourth inversion of a G6/9 is it LOL?

>>chords with multiple thirds where one is below the lowest occurence of the tonic seem to be unpleasant. C 032010 has three Es and sounds awful because of the low E honking out.

What's wrong with C/E? I think it's an excellent chord - a few Tom Waits songs benefit from it (Please Call Me Baby I play C - C/E - F - F/G) and I like it as an alternative when accompanying a lot of Scottish tunes where the emphasised third I think is really nice. A lot of Dougie Maclean stuff in Open C uses 404000 (Caledonia for instance) and it's lovely. And G/B I use all over the place.