Curved endings

I am having some problems with the alignment of the curved endings of typeface design. If I align the corners below de cap height and above the baseline the result when I print them is unpredictable, and some stems look shorter than others. 
On the other hand, if I align the corners with the cap height and the baseline, the letters that end with vertical stems look bigger than those ending in horizontal strokes.
I have thought about including an alignment zone below the cap height and above the baseline, but I suppose that would result in too many alignment zones.
Any advice? Thanks!