How does windowed mode work out for you?
When I've trouble alt-tabbing with something I set it to windowed and use this pseudo-fullscreen .ahk script, sets the window resolution and moves it all the way to 0,0.
F12::
WinGet, WindowID, ID, A
WinSet, Style, -0xC40000, ahk_id %WindowID%
WinMove, ahk_id %WindowID%, , 0, 0, A_ScreenWidth, A_ScreenHeight
return