Best Speaker Placement Rules you've used?

Thanks to all for info especially 'Restock' for the explaination of the spreadsheet.Q.I have a terrible loungeroom/stereoroom setup. Room dimensions are H=2.7m,W=3.65m & L=7.6m. Unfortunately I can only place speakers on 1 width wall (3.65m) and it has a opening used as a walkway. The maximum I can have the FRONT of the speakers is 1.1m from back wall, otherwise it is in walkway.Other side has brick wall and is OK.
I currently have Audio Physics Virgo 11 powered by Krell.
Can anyone recommend solution?
Possible back wall treatment so speakers can be closer to wall?
My dim mind will greatly appreciate the light of experience.

Thanks Luna for your comments. Unfortunately I can't use the long wall, nor can I place the speakers in the centre of the room (I've checked the Audio Physics site before). I live in an apartment and the combination dining/lounge room has all other rooms coming off it, so it is a heavy traffic area. Hence, I can only have speaker fronts max. 4 feet from rear wall.
Will any sort of rear wall treatment help stop reflection and interference so I can push the speakers closer to the back wall?
If anyone can give suggestions/advice...much appreciated.