new version v21.2 with bug fixed.
Hash rate drops regulary on 2018 ti /undervolted/ on equal intervals - 10 seconds 2.03 g/s, 10 seconds 1.74 g/s wich is strange. No such drops with bminer or gminer.
Have you tried with stock settings?
Just tested it. It seems to hold little bit stable 2.10 - 2.14 g/s, but drops to 1.8 in longer intervals compared to undervolted card. Maybe it's power related or maybe it's normal, I dont know. I just expected to see relatively stable hash. But yeah, looks better not undervolted.
https://imgur.com/oCeKoVU