Out of curiosity on your screenshots, it shows using CL drivers 471.41, however, when I start the miner mine is showing it is using 330.0 is that normal for an AMD card?

I've also tried the --xintensity parameter from 12 upto 240  and -1 (12, 24, 36, 48, 64, 120, 240) and while it does seem to 'bog' my system down more at the higher intensities, my hashrash stays between 57-59.  Pool: 2miners, us server, Card: AMD 6800XT on adrenalin 21.30.15.01