There is no way to remove data disks from aggregate. It is possible to convert RAID_DP into RAID4 by removing one parity disk (but RAID4 is frowned upon today). Alternatively you can build new aggregate (it can use minimal number of disks initially, even 2, so you can utilize existing spares) and relocate root volume to this aggregate, then destroy original root aggergate. Relocating root volume is possible non-disruptively in your case (but see http://community.netapp.com/t5/Data-ONTAP-Discussions/Epsilon-and-root-move-from-an-aggregate-to-anoter/m-p/138789#M30619 for caveats).
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