The reason I asked you what type of pan you are using is because I thought that perhaps a dark anodized pan might be a better choice. In the U.S., such pans are available from places like pizzatools.com (Lloyd Industries), American Metalcraft and Chicago Metallic. However, because such pans cost orders of magnitude more than the Baker's Secret pan you referenced, I did not want to suggest that you buy such a pan without knowing if it will work for your purposes. So, to get an answer as to the suitability of a dark anodized pan for making gluten-free shells, I called pizzatools.com since I am aware of their PSTK dark anodized pans and disks and own several of them and can speak to their high quality. After I explained your dilemma to the customer service rep (who said she has a niece with celiac disorder), she spoke to the president of the company since she did not personally know whether people, including those in the pizza industry, were using the PSTK products to make gluten-free shells. She was told that the people who have used their PSTK pans to make gluten-free products have reported that, while the PSTK pans are not perfect, they are better than the other types of pans that have been used to make such products. She cautioned me, however, that their pans do not require bake temperatures or bake times that are as high or as long as used with bare aluminum pans, and that one should avoid using temperatures that are too high or bake times that are too long. She said this was true of all pizza products, not just GF products. She also suggested that one oil their pans or disks before baking the GF shells. Because of the cost of the PSTK pans and disks, she suggested trying one pan or disk before committing to further purchases.
As for possible pans, the customer service rep said that the a PSTK disk is a good choice for a thin-crust shell, a cutter pan is a good choice for a medium-thickness shell, and one might consider a deep-dish pan for something on the thick side.
pizzatools.com does ship to Canada. You might also find that there are vendors in Canada who sell dark anodized pans comparable to the pizzatools.com PSTK pans and disks.