We have a CSS11503 (no SSL module), and are using stickiness rule for ssl-id, as:
....
balance roundrobin
advanced-balance ssl
application ssl
.... etc.
What subsystem logging will show the SSL-Id for connections. (We seem to get pinned to the same server when client is coming through a Datapower(tm) box, but working as expected, when coming directly from an IE/mozilla client).