Looks like the F10 map isn't fixable, sadly - did a little research and it's a problem that appears to plague all multi-monitor users. It is a little annoying but I can probably punch in the L/L of units blind on the CDU at this point (which is what I would use it for, primarily).
I don't know why the display for ground forces gets stretched across the screen, also appears to affect the FPS quite severely. It's in Beta so happy to cut them some slack and it's not a huge priority for me at this stage. I hope ED know about it and solve or provide a workaround.
I can probably live with those annoyances and at the end of the day, it's something that's a limitation on DCS's end and not the iPad software. Just need to evaluate whether iPadpit is enough at this stage or I pull the trigger on the $30 app..