It seems like what I read on this forum the vast majority are not into home theater set ups , just 2 or multi channel music. I love my music but I enjoy a bang up movie too working that sub!
l am in the 2-channel biz, but I prefer HT myself. I also have a dual system.
I have a tweak for you that will lift your HT system to new heights:
Jitter from the OPPO is again the issue, as well as jitter from your smart TV or cable box if you use one.
The fix is like my Synchro-Mesh reclocker, but this IFI SPDIF iPurifier reduces jitter for Dolby Digital and DTS:
https://ifi-audio.com/portfolio-view/accessory-spdif-ipurifier/
At $149, it's a no-brainer. Just buy it. It has coax and optical in and out, so compatible with any system.
The Synchro-Mesh is the one to beat for 2-channel, but the iPurifier is the best thing for HT.
If you have a flat screen between your front left and right speakers, you would greatly benefit from diffusors between the back of the speakers and the screen. In my system, I use 1/4 round tube-traps to scatter the backwave from the speakers. This improves depth and width of imaging and improves focus. Putting a quilt over the screen does not cut it. Check out tube-traps from ASC:
https://www.acousticsciences.com/products/fractional-tube-traps
You can find 1/4 rounds used on ebay sometimes. See how they are used in my older setup:
http://www.empiricalaudio.com/about-empirical-audio/
Steve N.
Empirical Audio