I have not read all the thread, but looks to me like a pretty nice system but with a challenge in speaker placement.
I would suggest to you to try to place your speakers in dedicated stands and place them at 1/3th of your room lenght size and 1/5 of your walls (L-R) and give it a try from there.
Again, maybe this was recommended earlier in the thread, so it would be adding up to such comment.
Regards,
Fernando