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.
What thread concurrencies are you using for #2 and #3? Try 8192 as #1 and #4.
I wish it would work it does not. cgminer crashes on the 3rd card I listed when changing -g 2. The second card is slower with 8192, g2.
--edit---
Said that backwards - 2nd card crashes, 3rd card slower - heh just got excited at making some progress with this issue.