Ah sorry now i see you wrote you’re using latest drivers. Since you cant see mem temp in hive os maybe you should try using windows if you can to set it up and see the temps? Your card might be thottling due to mem temp, dunno rly.
I got this card few days ago and still tuning it, but with latest drivers I’m using gminer getting LHR detected once and so runing @ 88-89mhs - 72.5% unlock with GMiner atm. Clock 1200/2600 PL:350 even tho the highest it goes is 268W (read somewhere lower pl can cause problems even tho it doesnt really limit the card)
PS: try lowering the memory if you havent already like 2500 2400 2300 to see if it stabilizes