Making Unity 2D Physics More Deterministic?

I know that there will always be those floating point errors ruining my day but is it possible to minimize these errors and maximize determinism so that given the same input, nearly the same results will appear on different platforms? I think the source of my question is my lack of understanding of how some of the 2D physics values work. Anyways, I don't need an in-depth explanation of those values; just an explanation of which values I need to tweak to persuade the physics results to be reasonably deterministic.