Personally, I've found one of the more stimulating ways of playing in recent times has been to kind of move outside the free improvised area and work with people who are probably improvisers but they have a particular way of working.
Namely the manager will assess what he believes a player is worth and he will discuss that with the board and then we will go after that target. If we can achieve it at that target, great, but if we can't we will have to move on to the next player.