Table alignment

Hi all.

I have a brochure with hundreds of price labels, which are tables. Sadly at no point has a cell/table style been created for these, although all rows are paragraph styles.

I've been asked to decrease the heights of these tables overall which is easy enough using leading/space before within the styles, but when the cells shrink, the table reduces height of course at the top and bottom, whereas I want it to stay bottom aligned. I've got that selected, but it still moves up as it's taking space from top and bottom. As I say I have the frame bottom aligned, and also the cells are bottom selected. 

Also - I haven't been able to find a way of altering the insets of every cell at once - just individually. Is that possible? I know, they should really be table/cell styles but they've not been initially set up that way. 

Before - after - desired outcome: