Highly reflective room there, I would look to an area rug to go under the coffee table to tame some nasty reflections. The shelf above the TV works well for a center channel IMO, why not leave it? I would actually move it up a little more and angle the speaker down a little towards the listening positions as in it's current position you could be getting reflections off the top of the TV.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70