If this is new install and there is no data, it is more simple to reinstall. It may be possible to avoid it by creating small aggregate, moving root volume to it, and then destroying existing one. It will take almost exactly the same time (you need to zero disks anyway) and some experience, although conceptually it is very simple.
I'm going to go ahead and accept this as the solution. I don't think we have the software. I'll look into the breaking aggr or RAID group, creating a RAID 4 group, and placing a second aggr on that one. NDMP vol0 to the new aggr1 .Then move vol0 back, and re-absorb the drives.
Thank you again, sir. I see you helping a lot of people, you must not sleep!