I like where Lovin' is going with his question, but if you want to improve things, you need to actually put your Surrounds on the ground. Rears are nice.
But:
The bed layer needs to be solid for the sound field to work properly.
You could easily put real Surrounds down and have an instant 5.x.2 with Top Middle if your AVR supports that.
I get there are always things we have to work with, and around, in this hobby... and perhaps you have legitimate reasons for your setup now. just at the superficial level, this is what I see and would look at addressing if it were mine.