That was on the 604 by the way and I've only completely filled the 605 once so far so no way of knowing yet what it's quirks are.
Same fuel system - it was one of the bits we didn't touch from 604 to 605.
I think the only reason we had it dump at Kef was because the ramp is on a lateral slope so that all the snow runs off into the drains, as a result the left wing was probably a couple of feet below the level of the right wing.