well, maybe one of the devs would spot it and want to figure it out

anyhow, try this for your single monitor layout:

mainA: x,y( 0,0 ) w,h( 853,1024 )
cloneB: x,y( 853,0 ) w,h( 427,512 )
cloneC: x,y( 853,512 ) w,h( 427,512 )

aspect ratio: 0.833

you may lose the edges of your action bars though... but there are add-ons that could help with that