No issues with the debug but it shows the phone roaming 5 times to the same AP. I noticed your WLAN is 802.11g only, is that for a reason? You may find performance will improve if you make it dual band or 802.11a only.
For adaptive 802.11r please check the Over the DS is ticked below the Fast Transition option (under Layer 2 in the WLAN).
Or the following config will implement 5 GHz, over-the-ds adaptive .11r, and authentication key management (akm) for the wlan to assist with performance:
config wlan disable 12
config wlan radio 12 802.11ag
config wlan security wpa akm 802.1x enable
config wlan security ft over-the-ds enable
config wlan enable 12
Note: A brief outage will occur for above config to apply. Not saying this is a full fix but may assist..
Ric
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