I fixed up a testing session outside... power, laptop, new phone line from the Actiontec C1000A kit, Ethernet cable, and both the Westell and Actiontec modems.
Here is what I got from each modem by connecting them with the new phone line directly into the NID outlet.
No improvement from inside... and if anything the C1000A is slightly worse.
My parents are right next door... the distance from the Centurylink box at the road to their house is about the same as it is to our house. I had her check her DSL stats and they are getting 61 dB line attenuation with an 8.5 dB Margin... yet their speeds are only 608Kbps. I know I have checked their speeds before and got 1.5Mbps, so I am not sure what is going on right now. Anyway... I can go down there and not ever get a timeout using their DSL.
It seems the timeouts might be better with a slower speed. Does CenturyLink have some way to cap the speed limit to say 1.0Mbps and let me test the timeouts?