This is my lighter timing, hopefully stable:
--CL 19 --RAS 30 --RCDRD 12 --RCDWR 6 --RC 44 --RP 13 --RRDS 5 --RRDL 5 --RTP 4 --FAW 18 --CWL 6 --WTRS 4 --WTRL 9 --WR 15 --WRRD 1 --RDWR 18 --REF 17000 --RFC 248
please test it.
latest 19.4.1 drivers. win10
vega64 lc ~1360/1100@875 51.4mhs with claymore 12. But hbm temp is hot 70C and one weaker vega gives sometimes red incorrect shares
22.3 kh/s trtl, testing for pool speed and hw errors