Destination Address Affinity persistence not working

I'm new to F5 and with that said we are using source address affinity and it works great; however, I need to change it to destination address affinity. When I changed it this morning we had 0 connections but then as the connections began I noticed every single connect was going to only one node and not the other 2 nodes (3 nodes total; IIS web servers). When the connections reached 60 on node 3 and 0 on the other 2 nodes I changed the virtual server back to source address affinity and the loads immediately began to balance out.

 

 

My question...

 

What do I need to do to use destination address affinity? Do I need to change the load balancing method?