Microwave ovens with a wave guide make any network melt down. JJ
I was faced with the same problem so I started moving all my customers to 5.8 and added a 2.4 AP to them so I could run a hotspot from all the customers locations. I use rb532's for all customers.
The towers 2.4 antennas are going to 5mhz on 3 channels and the other two 20mhz channels are for the hotspots.
I got to it before the mayor could spend the towers money on something the town already has. I also told her I would go to the new paper and give them a nice story on more city funds going to waist on something thats already being done by a local home town company. And that she wants to give our towns money to an out of town company when the home town company can finish it with or without the towns money.
The free service will be sponsored by local business and then theres the faster paid service and to boot if you are a fixed base wireless or DSL customer of ours, you get a free high speed service use/pass for the hotspot. Next I want to start handing out WiFi VoIP phones to some good customers to play with.
I know this rant really doesn't help you now that your way past that point. But maybe some other wisp's will get on it before they end up like you.
And again, I'm sorry to hear you have this problem.