I've fiddled with the settings as much as possible but it seems that as long as comments are included in the window the game is hard-coded to expand the height of the selected member row in the roster.
So, although I do have a working version that allows notes to be toggled for each row the hard-coded dead space will still be included.
The closest I have come to maintaining the information you want whilst keeping the dead space to a minimum has been attached, and essentially is identical to the version I posted previously but with notes below the location.
Sorry, forgot to take a screenshot
~G