Frankly, I'd rather sit and write down the theme or themes (I could identify one, like F,E,Bb,A and violent hits on the bass, as a sort of accompaniement), but there is no rythmic structure, neither counterpoint movements, or whatsoever questions, answers and any developments that keep drawing the attention of the audience. You need to create all that if you intend to achieve a convincing result.
My personal experience with improvisation, is that it can never beat a properly written composition. The point is to have a couple of ideas, then present them, make them evolve, variate, come back, etc, etc, and arrive at a sort of conclusion, at the end. Everything must be justified, as to convince the ear, and keep attention high. Here I try to do something, by improvising on an oriental tune, as I have no time to sit down and compose at all:
http://www.myspace.com/havenotime/music/songs/110424-000-mp3-81455441Conclusion is that one can never achieve perfection by improvising, one must sit down and write.
Many jazz professionals keep playing same ideas so often, that they can compensate for non writing down, but this is a way to make money, not to innovate ;-)
meilleures salutations
ak