Have a snapshot of the miner interface? Like this one:
I’d guess the SocMHz on your is low, regardless of what you set in the GUI configurations. Is the GPU stable or does it go up and down a bit? Does the wattage/voltage change along with MHs?
Taking the time to run the script can lock some of the poor performing cards and then you might have better results on getting the rest of the spec’s to stick.
Have you tried the specs on your other 6800? That’s showing pretty high wattage for not much gain. Mine run higher MHs when backed off to 1275-1300 core clock prior to running the upp-fclock scripts.
Have you tried running the poorest performer solo?
Good luck!