First of all, I'm quite a beginner, playing for about a year or so. For a long time I've been studying the Bach Cello Suites for bowing techniques (haven't got any of them good yet though) and the only pizz. playing I've done so far is just walking with one finger.
I play with a couple of guitarists playing Django-esque Gypsy stuff, and I'd normally pull my bow out for my occasional solo, but today, I didn't have one.
My solo was ok, my second finger could cope with the fast lines because of my background in bass guitar, but the tone was horrible. With my first finger I can get a really fat sound, going for a technique similar to Ray Brown's.
How can I get as much flesh under the string as my first finger does while still maintaining speed?
And how would I still get a fat sound using more of my fingertips rather than the sides of my fingers a la Stanley Clarke? (not that fast yet though

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ps. Sorry for the essay