Question # 2--how to avoid the DHCP conflict issue, double NAT, etc.

I'm having a tough day wasting hours working on the TC. It once worked fine for a year. Now, I'm struggling to maintain a connection at all.
I may be doing this wrong but I'm using two screens to manage this.
1. preferences/network
2. the TC internet connection settings
I had written all of my settings that worked on a piece of paper. Now that I've had to reset everything earlier today by plugging/unplugging stuff per Comcast orders, I'm wondering if all of my previous settings are worthless.
Reading possible solutions on here I tried to set the connection sharing to bridge to avoid the double NAT issue. This resulted in a message that more than one computer had the same IP address and I couldn't access the internet so I went back to sharing the public IP address like I had before.
I had, and I'm trying to have now, IPv4 configured manually. When I use settings like I had before, it tells me the DHCP range is invalid. If I increase the 3rd digit/group of numbers to change the range, it re-boots but I'm unable to get to the internet.
I don't know what I'm doing wrong. Any help?

Thanks to you both for responding.  I had actually already read that Networking 3.0 document ... and since options 1-3 were not allowing the QuickVPN to work and options 4+ resulted in lost FIOS TV services I wasn't pursuing any of those options.  Out of all of them it sounds like Bridging the Westell would be closest to what I want (enabling the Cisco router to acquire the public IP address).  But I'm not willing to sacrifice my TV functions so even that option is a non-starter for me.
Over the past two weeks I have spent some 30 or 40 hours researching and then tinkering with the configuration on the routers (and VPN client software -- QuickVPN and shrewsoft VPN client).  So I just invested about 15 minutes in downloading the free TeamViewer software.  And although I didn't want to go the "3rd party software" route I'm actually glad I tried it.  I now have a working VPN connection via TeamViewer, and through the VPN am able to use windows remote desktop just fine -- which was my goal all along.  I'm concerned about the 3rd party software / security ... but at least this works.  And I can always disable the TeamViewer Service when I'm not using the software. 

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