Although both those titles are popular, thought I would just ask if there is any way that you could try testing HoN Heroes of newerth ?
LoL didn't allow custom VGA settings, and DoTA2 is close but not mentioned, but nothing like compatibility that I have seen produced from HoN.
Considering all 3 LOL HoN, and Dota2 all ride on 4x styled engines using mostly dx 9 an 10 something newer cards are having big issues with on Win10. Just something I noticed and thought I would ask. Oh, 1703 bombed hard, if on 1703 retreat to earlier editions, posted yesterday at ms news central.
I turned on the Power Efficiency and seems it worked, i played Heroes of The Storm and League of Legends with no issues in 16.11.3 as well in 17.4.3. Maybe it is a possible solution for the black screens. I hope it be a permanent solution