Since you say "redo" it would seem that you dont need to preserve //anything//, as in absolutely nothing. If that's indeed the case, reboot the systems and when it says to hit Ctrl-C for special boot options, do so and perform a "4a" on each.
Once everything is done, each controller will come up and grab at least 3 disks. After you've completed the configuration of each node, change the aggr option on N2 to be raid4 to free up a spindle. Unassign that freed up disk and then on N1, assign all unassigned disks and away you should go..