For the obsessed tweakers out there.. after you spent countless hours moving your speakers by increments of 1/8 of an inch in every direction listening to your reference material until you found nirvana, what is the optimal space from the back wall and side wall for the M80 speakers ?

Acoustic Zen Adagio, Veritas center, Axiom EP500, QS8s, Anthem AVM20, MC20,Adcom GFA7400