Are you actually able to structure your improv? If I'm not happy with a solo I don't bother putting it together coherently - I just improv until I like what comes out and then hope I hit the record button already, I can't dream of actually redoing a solo and leaving anything in there because I'm never happy with what's come out. I'd love to know how to not throw things out the window upon hearing them, I never find myself able to 'release' something so much as throw it out on the series of tubes before I go insane doing it over and over again.
Jeff