Since you were upsampling everything I assumed you weren't getting automatic sample rate switching and still needed to make a change in the SSL drivers. I also didn't see you mention that you were using a BNC cable for clocking. Maybe I made too many assumptions.
Yesterday the Samsung ED75C arrived and I installed in on a MULTIBRACKETS M Universal Flexarm XL White Tilt 26-32" (7350022732285).
The 26-32" version was enough, because the the ED75C is VESA 400 and only weighs 28.8kg, which is extremely light for a 75" monitor.
The flexarm is 79cm and allows freeform placement from about 10cm from the wall to a good bit in front of the speakers + tilt & swivel. In this image it's placed in line with speaker fronts and tilted slightly downwards.
I still haven't been able to get REW to read sound input from the SSL for Analysis & Convolution so there is a good bit of of work left on sound optimization, but it already sounds great.
I watched Hobbit part I with the kids last night and it actually seemed better than the movie theaters ( I know I could be biased here...). Up close, the ED75C really fills your field of vision and the sound is incredibly good.
(For movie watching, we pulled the monitor out as much as possible)