Exchange Forms-Based SSO doesn't work in APM+LTM mode

Trying to load-balance Exchange and F5 Support says that I need to remove the "Full Resource Assign" from my VPE to put the VIP into APM+LTM mode to utilize the pool. When I do this, my SSO no longer works and I get prompted for the F5 portal and whe Outlook Web App login.

 

 

I'm running verison 11.1 HF2. and have two CAS servers in a pool. Anyone able to get OWA load balanced with an SSO?

 

 

Thanks!