Don't know if you still need it but the way i did it ,was by making a new profile in the steel series software. Now what i normally do is make macro's for each specific key. If i did this only Mouse button 5 worked... anyways It is pretty simple. Just make a new profile and set it to default settings. (don't forget the basic stuff like loading the gw2.exe file) No need to make macro's even.
Next time when you log into gw2 it will recognize the buttons. Only "downside" is that they recognize it as another key. So for example my mouse button 1 was bound to G for some reason. Perhaps this will help you out for the next BWE :-)