What kind of speakers and receiver are you using and where do you usually watch television from?
Ideally, you want the television directly in front of you. Also, how about switching the locations of the TV and computer. Put the television along the long wall, and the Lt and Rt front speakers to the side of the television with the sub to the side of the Rt speaker nearest the window. Then you would be running your surrounds on the bottom left and bottom right of the schematic you drew, one on each side of the bed. Finally, put the computer where the television was. Just my $0.02.