One thing to keep in mind re: roaming - devices tend to "stick" with their current AP even though there's a perfectly good same-SSID AP with much better strengt

One thing to keep in mind re: roaming - devices tend to "stick" with their current AP even though there's a perfectly good same-SSID AP with much better strength available. There are protocols that can orchestrate between APs to "kick" stubborn devices to better APs: 802.11r, 802.11k, and 802.11v.