A couple of things here:
1) Are you using monitors that are type HTTP or HTTPS? If the Client Access servers are expecting encrypted traffic, you'll need to make sure you're using HTTPS. This could be the cause of the problem you're seeing.
2) If you're sending traffic on to the Client Access servers encrypted, you still *have* to decrypt at the LTM, and then re-encrypt, in order to use any of the guidance we provide. Those virtuals all (well, except for MAPI) depend on being able to see the unencrypted traffic.For instance, in the HTTP traffic we need to see the URI path, the User-Agent, the Auth method and any cookies. In LTM parlance, you're going to need a clientssl profile and a serverssl profile.