Hi James,
When using a 6500 in Hybrid mode we recommend using the following minimum CAT OS and IOS version and requirements.
CATOS 8.5
IOS 12.2(18)SXF16
Also, we would highly encourage you to use L2-redirect and Mask assignment as the redirect and assignment method configured on your WAE(s) which would require the WAE(s) to be layer 2 adjacent to the 6500.
Lastly, you should use redirect in statements only (typically 61 redirect in on the LAN facing L3 interface(s) and 62 redirect in on the WAN facing L3 interface(s)).
By using L2-redirect, Mask assignment, and only redirect in statements, all wccp redirect traffic will be handled in hardware on the 6500. Any deviation from this will cause increased CPU utilization on the 6500 and may impact performance.
Cheers,
Mike Korenbaum
Cisco WAAS PDI Help Desk
http://www.cisco.com/go/pdihelpdesk