Update.
Spent several hours in the "crawl space" in my ceiling coughing up insulation.
Got it all installed. Was unhappy with the bookshelf speakers and found out my center channel was blown, plus it was crappy with only one 4 inch speaker and a tweeter.
Got on Marketplace again and found 2 Sony Towers 3.5 ft tall and about a foot wide for $35.
Took the existing Left and Right bookshelf front speakers and wired 2 of them together as my new center channel. This worked very well. Super clear voices and plenty loud. Glad I didn't go buy another "center."
Everything sounds pretty good now (to me) and I do l enjoy the atmos effects.
I've adjusted some of the levels manually at this point. I've had to order a calibration mic to use auto calibration and am hoping to hear a little improvement after that as well.
There are 2 things that could be improved IMO:
One thing I've noticed that bugs me is I wish I actually did have dedicated rear speakers as well. This might be because I have an open floor plan with about an 8' empty space behind my couch, but my current AV receiver doesn't support 7.1.2, so I guess I'll live without for now.
My subwoofer works, but doesn't deliver enough bass to suit me (probably also due to my open floor plan) So I'll keep an eye out for a deal on a nice 12 or something.
I can't believe how much time I've spent in the receiver menu figuring everything out, and then how much time I spent messing with tv settings, and then laptop settings trying to get surround sound from all of my potential movie sources.
Apparently Youtube doesn't support any kind of surround sound? and only my front towers play, which is annoying since I use YT a lot. This was another reason I upgrade from the 2 4.5 inch bookshelfs to the larger towers.
Anyway. Thanks for the help everyone!