RAID partitioning with existing data

Hi,
I'm planning on resizing my OWC Mercury Elite Qx2 (RAID 5, 8TB( 6TB)) to 1TB partitions each in order to avoid the FW800 issue, which slows the port speed down. Only problem is, there's a fair amount of data on the drives (approx. 65% used space).
Now I'm not sure, whether it is safe or not to repartition with the data on it. I got a backup of all the files, but all on different drives. Recopying them to the RAID would be a pain.
I tested the above with a 2TB (half full) drive creating three partitions. The speed increased significantly up to 20%. Do you think I could achieve the same with a RAID5 or are there other issues involved I haven't thought of?
Any hint would be greatly appreciated.

There are lots of workarounds:
Use Disk Utility running from a DVD.
Use Disk Utility running from an external drive.
Use Disk Utility running from another Mac using FireWire target disk mode.
Split the source mirror, remove one source drive and copy from one instead of the Mirrored pair.
Copy the mirrored pair onto a backup. Remove the pair and restore from the backup.
depending on which Mac model you have, use Optical drive connectors (2009 or later) or "hidden" ODD connectors to add an additional drive.

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