Doing two of the same things as the previous post; reducing 2.4 max power to encourage roaming, band steering for 5 GHz enabled clients. One other thing that is enabled by default now, but in the past was a manual configuration; disable lower data rates also promotes roaming and reduces sticky clients.
I read a long time ago to NOT enable load balancing in roaming environments as it may interfere with roaming as it tries not to place to much load on heavily utilized APs. I'll try to find the document that makes the claim.
