Do you think you cant put 6 hashing units for one controller ?
Any body that has two jupiter already tried that ?

Nice, but that's 5 not 6 right ?
Yes 5, but 6 are working too. I have under-performing boards, that I left in my other Jupiter:
Jupiter 1 - 3 under-performing boards = 320GH/s
Jupiter 2 - 5 good boards = 700GH/s
The only thing I did is just move the ribbon data cable over, so now I can't close the lid, because of the cable spanning between the boxes.