Ok, last night I got inssider fired up on a laptop. What a revelation, LOL. I totally fixed the antennas, so pretty much anywhere in the house is good to go on range.... so far.
I also was able to pick the correct 2.4G channel, based upon every other dummy's routers around me. I also moved from 40 to 20 on the bandwidth, which further helped.
As far as 5G goes, I'm in the dark as my laptop doesn't do 5G. I'll probably have work swap out the laptop with a newer model. However, I did notice a few things. I was having disconnects on my iPad4 & iPhone5, so I switched the 5G channel last night and that seems to have fixed that.
I very highly recommend using inssider with this router if you're having issues. I guess I never messed with inssider before because my old 2.4G Linksys E2000 just worked.