Another nice one. The high point for me is the figure at 5:00 - 5:20 but it's all good. I think it's quite hard to maintain interest within similarity. You've managed it here, but I'm not very good at it and usually take the easy option of contrast. I've noticed so far that the bits of improvisations I like are the bits the players abandon after a few seconds. Just what this implies about me I do not care to analyse.