Hello Les9596,
Hope you are well. Nice setup.
Don't worry about getting those surrounds to the rear wall. Recommended placement of the surrounds in a 5.1 setup is on the sides and slightly forward of the listening area. So, your placement looks perfect.
One suggestion for you, give 80Hz a try as your crossover frequency for the M22s and 100Hz as the crossover for the QS8s, will make a large improvement.
That is if the receiver can do channel specific crossovers, if not then you will have to stick with 100Hz since the QS8s don't go low enough for an 80Hz crossover.
Later,
TonyM
