It's probably the card, yes
or should i leave it at 0 and do --mt 1,1,1,0,1,1
I need to say it's hard to know what's the problem you have, but in general when I have some problem, better to start from zero again
Put this 1080ti in stock, no overclock, no underclock, don't change power limit, only set fan to 80% or more and try again, check on MSI Afterburner to not set overclock equal to same cards, every card need to have different settings
I suspect your card can't handle too much overclock