Roaming with Airespace

I have a network that has two 4404-100 controllers with approximately 65 AP's. I have a VLAN setup for WPA and ACS authentication, and the problem I am having is that I am dropping a ping or two when I roam from one AP to another. Is this something that is normal? I have several applications that are sensitive to roaming.
Thanks in advance.

According to Cisco documentation, Airespace has a fast roaming solution that is similiar to Cisco's Fast Secure Roaming. It is available when using WPA or WPA2.
As I have found today, even when I turn off all encryption, I am having the same issues, if not worse. There also seems to be an AP that the client almost refuses to roam to. If we wait 30 seconds, or we re-authenticate our client, it will associate.
We surveyed the facility with a Cisco Aironet 1231 setting the CCK to 30mW and using the AIR-ANT5959 antenna. The cells overlap very well and allow for great flexiblity in cell size so I don't think that lack of coverage is an issue.
One other question I have is how does the power levels in the Airespace compare to the power levels in a Cisco Access Point? The Controller with the latest version of code has power levels 1-8 with 1 being the strongest.
Thanks again for all input.

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