card #1 and card #4 have hit 700kH/s!!! Needed g 2 option.
However it hurts the performance of card #2 and #3 listed above in the case of #2 it crashed everything.
--edit--
cannot replicate the settings on card 2 or 3 either.

guess I should be happy with two performing as expected - still it does not answer a major question about all of these....