Small correction, I meant "When (1)(2) is followed by (2)(1) I would like the space between to be 10 pt and not 15 pt."
--- this spacing ----
It makes no difference what order, ID adds the spacing unless one paragraph falls at the top of a frame or column, then any spacing that would push the text down is ignored.
Yeah that's what I figured. I just wanted to add the correction, I wasn't able to edit my post.
I appreciate you confirmed it again though.
This is why the concept of cascading styles in page layout is a much-requested feature.