Hi Visanu,
Those tests would allow us to understand better what is happening. As of now we are not sure if this is a problem from our APs with the packet captures that we have.
For example seeing if there is a difference between the tests with iperf and pings (I think that we should try them at the same time) could show that there is a problem with ICMP packets on the roaming. And there we could identify the that the issue is from our Access Point and work on fixing the issue.