There ins't really anyway to create more room, other than to either as suggested put the connections in a joint box in the ceiling (which can be a little bit of a nuisence if you need to fault find at some point and someone has put half a lorry load of rockwool on top) or cutting a circular dryliner into the ceiling to mount the fitting to.
Its normally a case of just taking care with dressing the cables in the fitting I'm afriad, some of which comes with practice, and some of it is taking your time with it and thinking about where they'll end up when its put back on the bracket.