New
#1251
WEI only counts the primary card - it doesn't matter if you're running SLI or Crossfire.
WEI performance drops aren't unusual (usually it drops to 6.0) and actual performance isn't affected. For most, a re-run of the assessment is enough to get scores back to normal.
I've been running these since they were in beta and I haven't noticed any bugs myself. My idle clocks are fine too, but I did recall reading some people experiencing some issues.
I guess you're one of the unlucky ones.