The overlay on a sheet is definitely something I hadn't used before. Do you have any set procedure for making sure the views are overlaid exactly when you do it? When I tried your suggestion I just moved one view over the other on a sheet and used the point of my mouse to find a matching location as accuratly as I could since it won't snap to geometry in a view when that view isn't active.
Also, in my messing around with this I played with another way of kinda tricking the phases to get what I want. I thought that if I have multiple phases in my project (say 3) I could just think of that phase as a future phase and in a view that is in that 3rd phase, I override the "new" geometry in the phase filters so that everything "new" looks gray (for example). I then just let the rest of the previous phases in that view be defined to be seen "By Category" and it kinda give the effect that I'm looking for. I'll attach a little file that I've been messing with to further explain. Check out the view "Level 1 - Phase 3" as well as the Phase filters and graphic overrides.
It wouldn't let me attach the rvt files, so we'll try a doc with screen captures in it.
Thanks again, LWC