Did you check around to find out whether Aliant might be part of the problem??
Turbo Charged Connection
is this bell throttleing 3rd parties gonna affect aliant?? - dslreports.com

And also have a look at their T&C (bandwidth management): Aliant For Your Home - Terms and Conditions

Try changing LW's listening port: In LW tools > options > advanced > firewall config. Change LW's listening port to 65000 (or try any ports in the range of 49152 - 65535) > apply > ok.

Do download speeds get any better if you use LW outside of peak hours? Some providers only throttle at peak times.

For your firewall icon, try port forwarding. The instructions are here.
Port Forwarding for the Siemens Gigaset SE567
You'll need to set up a static IP address first, there's a link to that in the instructions above. LW's listening port, port in the 'manual port forward' box & port forwarded within the router must all be the same number.

Don't run without a firewall - just make that LW's allowed thru your software firewall.

Since you don't really have a connection problem - your LW connects with all 5 bars green - this will be moved into Download/Upload Problems.