normally, you have an HTTPS content rule.
This rule catches traffic to VIP x.x.x.x on port 443.
So, you just need to create a new content rule for the same VIP x.x.x.x and this time port 80.
Then you can add a redirect service.
If your SSL module was going back to the CSS to a content rule with VIP x.x.x.x port 80 already, you will need to change this to port 81 or whatever but not port 80.
This will require that every service be configured with a port 80 to translated from 81 to the normal port.
You can send me your configre at gdufour@cisco.com if you want me to verify.
Gilles.