r9 series need to stay on 9.7, they bug on 10.x except the 390
Agree, I didn't find the way to work 10.x with older cards.
I updated to the new Nicehash Legacy 1.8.1.5, which has the option to switch to Claymore's Cryptonight v9.7.
Running 9.7, everything seems to work fine now.
Thanks!