Voice over WLAN - Cisco 2504 and iPhones/Androids

All:
I'm working on a solution for someone who already has a Cisco WLC 2504 running 7.6.100 and 2602i APs. They are running iPhones with a SIP application instead of purchasing Cisco 7925G phones. They are having issues when roaming to different APs.
Site survey is good. I also used a laptop with Net Surveyor on it - signal looks good. SNR is good. They used to have coverage issues as well but I got that taken care of for them. Only issue now is roaming.
WLAN SSID:
-Qos: Platinum
-FT-PSK and PSK enabled
802.11a/n/ac Radio:
-Client Roaming: -67dBm for RSSI threshold and -62dBm for scanning threshold.
-Disabled 6mbps and 9mbps and 12 mbps is set to mandatory. All others are supported
802.11b/g/n Radio:
-Client Roaming: -67dBm for RSSI threshold and -62dBm for scanning threshold.
-Disabled 1mbps - 12mbps. 18mbps set to mandatory. All others are supported
Switch to which WLC is connected:
-switch ports used to connect to the controller are set to trust CoS and ports to APs and uplinks are set to trust DSCP.
With these setting changes - I believe most everything else is default. I am confused about the following:
-Best practice link - http://www.cisco.com/c/en/us/td/docs/wireless/technology/vowlan/troubleshooting/vowlan_troubleshoot/2_Gen_Troubleshooting_Guidelines.html
Says to configure voice WLAN to use 802.11a. Issues with that: Some Android's could not connect AND the big one - I am not able to set Qos to use 802.1p for the SIP WLAN. It tells me to disable 802.11a and 802.11b. If I go into each radio on 'Network' tab and disable these - NOTHING can connect to any SSID. So unless I've misunderstood something - this is a contradiction in the best-practice link I posted above.
another question: If I enable FT-PSK and PSK - for devices that support FT-PSK (which i'm under the impression is 802.11r) will these devices use that and for devices that don't they'll use 'regular' PSK? How do I know if my client is connecting using PSK or FT-PSK as both are enabled on the same WLAN.
Again - only issue is roaming. I second or two of 'choppy' voice then everything is back to normal working as expected. Any ideas as to what else I can enable to get these iPhones to roam better - if this is even possible. Can iPhones roam using a SIP app with zero voice interruption? This is the equipment that they got and can't get anything else so I got to make the best of this. Perhaps I've already done that? Any ideas/suggestions are very much appreciated.

Hi
Before any other think I would like you to upgrade your WLC image to 7.6.130.0 & FUS to 1.9.0.0. FUS upgrade will require 30-40min downtime to your wireless.
http://www.cisco.com/c/en/us/td/docs/wireless/controller/release/notes/fus_rn_OL-31390-01.html
http://www.cisco.com/c/en/us/td/docs/wireless/controller/release/notes/crn76mr03.html
It tells me to disable 802.11a and 802.11b. If I go into each radio on 'Network' tab and disable these - NOTHING can connect to any SSID. So unless I've misunderstood something - this is a contradiction in the best-practice link I posted above,
This simply says, you have to disable radio band before changing QoS profile values. Once you change those value you can re-enable the radio band. :)
If I enable FT-PSK and PSK - for devices that support FT-PSK (which i'm under the impression is 802.11r) will these devices use that and for devices that don't they'll use 'regular' PSK? How do I know if my client is connecting using PSK or FT-PSK as both are enabled on the same WLAN.
Read these 802.11r post & you will understand how 802.11r works. There are certain client devices does not like PSK & FT-PSK capability advertise on the same SSID & may have connectivity issues. But most of the clients like iPhone, iPads,etc will connect without any problems.
http://mrncciew.com/2014/09/06/cwsp-802-11r-ft-association/
http://mrncciew.com/2014/09/07/cwsp-802-11r-over-the-air-ft/
http://mrncciew.com/2014/09/08/cwsp-802-11r-over-the-ds-ft/
"show client detail <mac_address>" should indicate if client connected over FT-PSK or PSK.
HTH
Rasika
**** Pls rate all useful responses ****

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