trying to get multiple charts to align in width

I have multiple charts down the page and I have been trying to figure out ways to get them to align.
when the text of the legend is smaller and greater it auto resizes the chart plot area to different widths.
my latest fix I use monospace font and put a fixed number of characters into the legend.
the whitespace at the right side of legend crops so I had inserted html spaces & nbsp;
issues with this
1) font is different from rest of page and not best font for design
2) the right axis of my charts may have different numbers which may effect the width also and slightly show charts not aligned
3) the export image shows html & nbsp; as text instead of white space.

so to fix the nonbreaking space showing in the export I instead use spaces and add a period at the end.
issues with this method
1) looks stupid with a period out in right field

is there any way to
1) add a title to the legend to make it fixed width such as a number of _
2) set the width of the plot area
3) fix the export of image / pdf to not show non-breaking spaces