I ended up returning my SP3 since my return window was expiring. If they fix it I will try it again though. the WRT1900AC works beautiful with ANY device so it is OK and when they fix the Surface Pro 3 it should be fine as well.
I was able to revert back the driver on the SP3 and then it would work but only for a few hours, after a few hours somehow (without rebooting) the problem kept coming back, even with Windows Updates off, which is crazy to have to do anyway.
Without a solid Wireless driver, the Surface Pro 3 is an expensive brick. My $200 Nexus 7 tablet has a solid AC WiFi card, why can't the $1,500 Surface Pro 3 have a solid WiFi card? It makes no sense that Microsoft is not acknowledging this problem at least in these forums.