Over the weekend I did more test with my 5 various 3rd party Qi Fast Wireless Chargers (Choetech, Nektek, Yooteck, etc). All worked fine with my S7 Edge so long as I was using a Quick Charge 2.0 Charger and a decent cable. I had no issues. None have worked with my S8+ though the Nektek seems to start to work sometimes and not other times. Over the weekend, I tried using both QC 2.0 AND QC 3.0 chargers, then tried using the Samsung Adaptive Fast Charger. I also tried several different cables (all of which worked fine previously with the S7).
Nothing changed - none of these Fast Wireless Chargers which all worked great with the S7 Edge work with my S8+ regardless of which charging adapter I was using and with trying several different cords.