You can go to any SKI shop or discount outlet to buy iron scraper and wax. I am sure empire sells them online and i think they are based in quebec. I am not sure what you mean by "scratches on snow" but i am sure its not wax related.
Quebec's so icy you still go fast even without wax. And rub on wax works pretty good on extruded bases.
As far as riding flat is that it is difficult initially but you will get hang of it. Using higher angle on front binding helps so try 18 degree on the front binding. And ride more relaxed it will help you with not catching an edge.
Riding flat is really necessary to hit jumps rails etc so keep working on it