How to have sticky session with least connected

Hi All,
I am using ip_hash(Sticky Session) and I have a scenario for our web portal where portal is accessible over web, and we have support module which is also hosted on the same portal, and upstream is having load balanced with 22 nodes

1. No problem for customers using portal for Sticky Session.
2. Users loging in from support center are having performance issue because sticky session is making upstream to point same node for all user's which are haing same external public IP.

Need help regarding point 2.

Thanks