Room Stickiness

I'm pretty sure I've looked through all the settings/docs but apologies in advanced if I overlooked something. I don't think this is necessarily a bug more of a config issue.

I've set my room radium to a pretty small 4m. I've got two rooms next to one another both with a proxy on opposite sides of the rooms. When walking from room A to room B I'll see my distance from room A increasing above 4m (to approximately 7m) as I approach the other proxy however the area doesn't change. I would've assumed that distances >4m would either be unknown or would show as the next room but I'm not entirely clear on why it's hanging onto the old room for so long. I basically have to be on top of the other proxy before it swaps. After that I can back away and go around the room and it won't change. So to me it seems like rooms do have some stickiness and resist changing outside their radius. I'd like to be able to tweak this behaviour.

Again sorry if I missed an explanation somewhere.