Need expert cable modem airport extreme advice

I have been on hold with Comcast for an hour and so far no end in site. So I thought maybe someone here might be able to help me.
Because of Comcast's recent decision to cap bandwidth to 250GB a month I moved up to their Business Class high speed internet service that have NO bandwidth cap. I also get 16MB Down and 2MB Up for just $20 a month more, but the no limit on bandwidth sold me.
Anyway, they installed the new modem today while I was away, and when I returned home I saw that my Airport Utility was reporting a "Double NAT" error. Airport recommended changing the unit to "Bridge mode" (I also have two other base stations in the house), which corrected the Amber light, Double NAT error, but while I can connect to the net I am getting slower speeds.
Speakeasy.net is showing me that IF I use Bridge Mode I will average 8-10MB Down, and 1-1.5MB Up, but if I allow the Double NAT error by using "sharing a single IP" address I get an average of 15-20MB Down and 2-2.5MB Up.
Bridge Mode doesn't affect the other two units on my network, and while 8-10MB Down is still quite fast, the 15-20MB is a quite a bit faster.
So my question is this: Does the Business Class modem serve its own DHCP/NAT and if I set my Airport to "Share a single IP" it is redundant? Are both the cable modem and the Airport attempting to use DHCP/NAT and that is what causes the error? Lastly, is there a real reason for using Bridge Mode instead of "share a single IP", with respect to security, stability, or anything else? Does it really matter which one I use as long as I am able to use the net on my computers?
Thanks in advance for any insight you can provide. And yes, I am STILL on hold

http://www.mac-pro.com/Airport-Extreme-Base-Station-Power-Adapter
Just one of many if you enter AirPort Extreme Power Adapter in a Google search.

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