Also not a client will often not roam if it has no problems with its current connection. So although you might want it to use the geographically closest AP, if it is happier with one further away it can decide to simply keep using it. The only other option is to increase the minimum speed required on the SSID. This will force the client to roam when the speed to a further away AP drops. I would suggest using 12Mb/s.
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