As a followup, I have added more space since this issue arose, but it became a moot point. At some point this massive increase changed and it went back to using the normal amount. I think the 6.0.3 update did this.
I had updated to 6.0.3 by the time my new drives had arrived. (2x 1tb Segate ES2 for HSM) When I rebuild my server to add two drives I noticed that the drive usage was much lower. I looked back to our ghost image and noticed the same. I can't account for why, but I assume this was a silent pathc they added.
Mail | Dell 2950III | 2x Quad Core 5420 | 8gb RAM | 6x 146gb SAS RAID 0+1 | Red Hat 5.3 | Zimbra 6.0.10 Network Edition
Test | VMware ESXi Whitebox | Phenom II Black 3.2ghz | 12gb RAM | 6x 1tb SATA RAID 0+1 | CentOS 5.4 | FOSS, Not in use now