Intuitive page breaking?

I am developing a report that is very fluid in the number of detail lines and the groupings that are present. The problem that I am running into is that there is no way for the page to break smoothly. It is basically just spilling over at the bottom of the page and at the least I would like to keep the 3rd subgroupings together (which have a maximum of around three detail lines). I thought the keep together option would do this but it does not seem to have any effect. Does anyone have any suggestions?