Very low hashrate with Vega 64, does not compute!

[Lumikor]

Hash type is bcrypt blowfish, I'm getting only 2500 Hashes/sec. According to this: 
https://www.geeks3d.com/20181029/quick-t...-released/
I should get at least 18000 H/s Also benchmark results ar much much higher then what I get.

Using the latest Windows 10 and AMD drviers with latest hashcat.

Any advice and help will be appriciated. Thank you!

EDIT:
With -w 3 I'm getting only around 2900 H/s

EDIT 2:
Using rules doesn't get me closer to the benchmark or others results. Only prolong the finish time.