Ive dual mined beofre yeah , mild OC on the cards but they are only a few months old
I'm talking about memory overclocks.
You said 29.8MH/s. You need to overclock quite high to get that, not a "mild" overclock. Plus just a few months dual mining could have your cards start working weird.
29 mhs is a standard 2000 mem oc for rx cards its nothing out of the ordinary
core and temps are low and cards are undervolted as well, I dont see how dual mining can have the cards
looking wierd as you say , I dont think they are taxed that much