Did you tried it yourself? Bugs from 18.4.1 fixed? As I remember in 18.4.1 speed drops to 0 on several cards after different periods of time from start mining...
I`m using new drivers since last night on 2 rigs all good so far.
Vega cards? I heard that on Vega new drivers works normal... But on Polaris...
EDIT: Just installed 18.5.1 drivers on my RX 580 and 270X. Looks like Claymore's Cryptonote and Dual miners works normal... It's good sign...