Hi Johnto,
I have 3.7i with Oppo 105 and Bryston 4B ST. Your set up is better than mine and I agree with others the problem is not with your equipment. my room is not ideal - about 20 x 20 with about half of the back wall being open. My plus might be 12' ceilings with odd angles. i agree with the guy who is suggesting you consider your room dynamics. Dipoles can bounce a lot of sound waves around - certain frequencies can be attenuated and timing can turn bad and make things sound muddy. my room is too hard and bright, but with the window treatments closed it becomes very good. Using the 1 Ohm resistors for the high and a single Bass Panel i get non-fatiguing highs and mids, a crazy wide sound stage and very good center imaging from a fairly wide sweet spot. I have had some other very good speakers. There are a lot of things I really like about the 3.7i, but i actually consider the LOW Frequencies to be the best - fast, controlled and never boomy. nothing like it when listening to standing bass.