Client Signal Strength Threshold


I have multiple AP’s in my home (6 in all, mainly 1 in each room), I am trying to get devices to connect to the closest AP, so I am using “Client Signal Strength Threshold” to try to achive this, BUT, it does not seem to be working very well. For example i have an AP set to 30 (-65), but clients are still connecting to AP’s that are not in that room, and connect with -72dBm (see pics), Why is this happening ?