Building a new house and picked out Polk RC80i 8" ceiling speakers, 255C-RT centre speaker, RC85i 8" in wall speakers, and an OSD IWS-88 dual 8" in wall subwoofer. I am wanting to do a basic Dolby Atmos home theater set up. Lately I have been wondering whether the 8" speakers would be a bit of an overkill for the space, whether I should change them to 6" all round (except subwoofer). The lounge dimensions are 3800mm x 4800mm. Please see photos for layout. Have I got the heights fairly good as well or should I alter? Any tips or suggestions appreciated.