For those running Vega.  Below are some of my settings a hashrates. These are on a reference 56 running 950 mem, non soft table mods. Stock bios on the newest drivers - non-blockchain.

All below running V1 on Stellite.

Intensity/thread/worksize/hash

118/2/8/1863
119/2/8/1859
120/2/8/1888
109/2/16/1869
109.5/2/16/1892
110/2/16/1893
110.5/2/16/1932
111/2/16/1890
109.5/2/20/1851
92/2/20/1731
100/2/24/1793
105/2/24/1814
110/2/24/1832
115/2/24/1857
120/2/24/1892  *Locked Win - hard reset required after a few minutes then had to uninstall drivers and cards then re-install*

Appears worksize 16 was the sweetspot. Someone with modded cards running higher clockspeeds give it a run and post some results.