hi !
ProximityZone zone1 and ProximityZone zone2 are basically the same. you’re looking for the same tag/range. I think there is no way to solve your problem because of this: Proximity SDK More Details on Beacon and also this: What's the best approach for reacting on beacons when entering a zone of approximatly 3m or less?
I was thinking that probably one hack could be add a particular tag for each particular beacon then add a zone for triggerin onEnter/onExit events for any particular tag. I think this is probably overkill and I’m really lazy for trying. 
probably some Estimote people could teach us some (lazier) solution.
cheers !
dx