Okay, so after 2 16hr days now, I think I've found a small work around for the 7260.
I uninstalled the driver and went in and "manually" selected the driver I wanted, and I used the "non-Wireless-AC" 7260 version from Microsoft, the 16.0.0.62, and it seems to mostly be staying connected.
BTW, the AC version of that v# from MS also always disconnects, not just the latest.
I was also trying to install "earlier" versions but I couldn't figure out how to stop windows from installing it's driver version automatically?
So, it's not officially compatible, but at least I have internet. Not sure what other issues it will cause, like if bluetooth, widi, etc. will work? I'm guessing not.... I don't have either to test. 
BTW, someone was mentioning for one of the other cards that "enabling" the RTS/CTS setting in their router fixed their disconnect problem?
I checked my router, I don't have that setting. It's a Modem/Router combo from CenturyLink.