[tor-relays] Mystery of bridge utilization

I've got 2 bridges, with 1 IP address in each of 2 servers in the same geographical area. The IP addresses are not consecutive.

Both servers have the same hardware and software configurations. Both were established in mid-January and (excepting a few brief periods of down time) have been running since then.

So why then in March did one server handle 200GB of traffic while the other handled only 2GB? (Yes, a x100 difference.)

Also: is there something I can do to make my under-utilized bridge more attractive to the Bridge Authorities?

Thanks.