You are sure the hashrate is real also at the pool? Because I see an rejected share in the log. There is one routine in the code at the end that usually should sort out the invalid ones, but this seems to be broken at yours - interestingly only for the one card. I think the card is in fact hashing similar to the others, but produces ~50% defect shares :/
No idea yet why (I have not used ROCm driver much till now), but well - glad to see the driver working at all



Just now working on this. 0.6 will get a new host side mining engine that will hopefully handle things better More details to come



Generally lolMiner likes both, mem clock and core clock. So the best way I guess is to reduce core voltage and power limit to increase the efficiency. Overall I would try:
- leave core somewhere between 1200 and 1350
- memory up a bit - test whats stable
- power limit -20% and core voltage -0.1
This is likely a good start. Most ethereum settings with core clock at 1G or lower and high undervolt will likely end up in a crash or horrible performance here.