Center Channel Dialogue

I'm not familiar with your equipment, but I am familiar with the problem.
My center channel is on a cabinet under my TV about a foot from the wall.  The first thing I added were some isolation feet to the fronts.  I noticed cleaner bass, so I added them to the center and surrounds.  Not sure if they did anything for the center and surrounds, but maybe.  The next thing I added was 3 layers of carpet pad foam cover with cloth under my center extending over the back of the cabinet.  That helped a lot, but....  My Denon AVR was getting long in the tooth and was replaced with an Anthem processor.  Great improvement!  I think the Anthem room correction helped with the bass in the room and made everything sound better.  Audyssey didn't work well with my Golden Ear speakers with built in subs.  Great center channel clarity at higher volumes. The final solution was hearing aides....

You didn't mention anything about your acoustical treatments, which are the #1 issue when it comes to unintelligible dialogue.

I agree that room acoustics are a major part of good sound and the OP should probably focus on that first. He didn't mention anything about his room and maybe I I incorrectly took that for granted..
I have an irregular shaped open room, vaulted ceilings, and tiled floors.  I added some absorptive panels, shag throw rugs with padding, and a crude bass trap. It made my room better, but still not ideal.  I forgot to mention I did all of that before the other things and still didn't have clear dialogue.  So, I guess the "first" thing I said I did wasn't really the first. 
I'm not sure if you can cost effectively "treat" an average room to the point of making any system sound good, but maybe?

@elliottbnewcombjr - If the AVR has an auto setup with a microphone you just disconnect the center channel and run the setup.  It won't hear a center channel and will simply eliminate it from the processing and as a result split the signal into the L/R mains.

You can also manually turn off individual channels and it'll do the same thing essentially without the benefit of the auto setup.

mceljo

for simplicity, let's say center channel is dialog.

I understand your method, HOWEVER,

that does not solve 5.1 movies/music videos, streaming. 5.1 has DEDICATED center channel content (mono) as well as dedicated L/R rear/sub out. The 5.1 center channel content does not exist in the L or R channels, thus, for 5.1 content you NEED a center channel speaker.

When you tell your AVR to use 2 channel/stereo mode (as I often do), it then reassigns the mono center channel content to the L and R channels  (dual mono) so a phantom center image exists as it does with our 2 channel music systems. The L and R are also making phantom imaging (a bit left/a bit right/center) like 2 channel stereo does. The rear and sub out are also moved to the front L and R, directional cues lost, but content present.