Hi
One idea is to make your own, it isn't too difficult, you could probably just use your existing cable, I guess it is the plugs that are problem.
Note that CW1308 if that is what is from that site run-it-direct is solid core cable, the RJ45/RJ11 connectors are typically made to connect to stranded cable, therefore the connection in the plugs is not likely to optimal and can cause a bad connection over time.
Given a metre distance or so, the cable isn't going to make much difference and we are in the realms of snake oil, if there is a difference it is often because the connectors are new and clean. Gold plated plugs if connected to equipment that are not also gold plated or has the gold plate worn away causes corrosion between two different metals, over time this causes a poor connection.
Regards
Phil