Just for comparison, my download speed to the site you listed is about twice yours. About 750 KB/s, which should be, what...about 6Mbps? I've gotten other downloads up to about 16Mbps using bittorrent, so maybe it's a bottleneck in Windstream's routing somewhere?
SNR Margin (dB): 15.3 12.0
Attenuation (dB): 22.5 11.7
SNR Margin (dB): 17.0 12.4
Attenuation (dB): 23.0 11.3
Assuming that higher SNR Margin values are better (since that would seem to mean that you have a better signal to noise ratio), it seems that your lines are better than mine...