Please help, Airport Extreme incredibly slow

Someone please help if you have any idea what to do.
I have a 5th Gen (dual 2.4 and 5 Ghz) Airport Extreme and have been using it successfully for the last 2 years.
It has been connected to a Mac mini, Macbook Pro, Macbook Air, 2 iPhones, and an iPad.
I recently moved and was forced to switch my ISP from Cox to MediaCom.
I have a Scientific Atlanta 2100 cable modem and an Internet package that allows 30 Mbps.
However, I can only get 0.5 - 1.5 Mbps less than 50 feet away from my Airport Express (AEBS).
I have been searching the Internet and trying to solve this problem from 3 days and am ready to throw the AEBS out the window.
Here is what I have tried:
I had MediaCom visit my house twice. They tell me to get a DOCSIS 3.0 modem, but I'm already getting close to 30 Mbps when I connect my Macbook Pro directly to the modem via Ethernet cable so I don't think the modem is the issue.
I have also accomplished:
A soft, hard, and factory reset on the AEBS
A complete shutdown and power up of the modem, AEBS, and ALL of the wireless devices in my house.
Changed the 2.4 and 5 GHz channels manually to improve signal quality and decrease interference
Downloaded iStumbler and searched the house for the best reception locations
Tried to force separate 2.4 and 5 GHz networks to improve download speed
Used an Airport Express to extend the network (with no success)
I simply do not know what else to do other than buy a new modem or router.
Any help is MUCH appreciated.

If you are using the same Mac, looking at you OS it would appear that you have upgraded to 10.8.4.   Did you upgrade your RAM at the same time.   You need at least 4GB and even that would depend on how much you have going on in the background.
Or have you a newer machine.   Incidentally, your profile is out of date. 

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