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To get back 1600h/s xmr stop your miner, go to radeon settins, gaming and move HBCC slider slightly, then hit apply.
Then run you miner again, here you go again ))
Need your kisses ))
Same results for me using HBCC, I got 1020H/s with vega 64 core 1150@900v and ram 1100@900v driver 17.9.1 (but with 17.8.2 was the same). I use intensity 1536 and worksize 16 and i tryed many value including 1500/8, 1000/16 1000/8 and many similiar. What's the trick?
Blockchain drivers will do the trick.
But it is difficult to downvolt with them ...