My personal workflow is this:
Try something with the custom spacing ratio of notes (not too much!).
If there are staves which are quite full (e.g. 97%), i try it by setting a system break before the last bar of the staff. Often the whole page gets recalculated by such a prodedure and solves the problem. Or: i do the opposite, means combining a bar to a slightly filled staff (e.g. 70–80%) in order to force Dorico to create a e.g. 102%-staff.