I just started and following the blogspot walkthrough. Just did the software reg edit.
Only have 3 of four cards setup right now - I somehow just realized I have a fourth I need to add in. Nerves!! Lol
There isn't any need for pain.
Here is a very decent overview guide, but it is tailored towards XMR-STAK. With minimal tweaks to the "StartMining" .bat file, you can get the same automated setup to run with Cast.
https://vegamining.blogspot.co.uk/And here are some screen shots I took which may or may not help your setup:
https://imgur.com/a/fuXnsOne of my Vega rigs is on a MSI X370 and I am simultaneously mining away with the Ryzen cpu using XMR-STAK-cpu. The other build is Intel using an older MSI Z97a board that I had.
Both are very stable at this point.
My experience: install all the Vega cards at once before installing the driver.
Go online to Microsoft and download the Fall Creators Update, which is free. I was stuck at 3 cards until I did this update. Working well for me, YMMV.
Do set a very large System page file.