Heat your oven to 425°F before you do anything else. Roll the dough on a lightly floured surface until it is about 1/8 inch thick. A hot oven at the start helps the crust turn crisp instead of soggy.
Lay the dough in your 9-inch pie plate and press it gently into the corners. Trim the edge to about 1/2 inch past the rim, then flute it with your fingers. Pop the pie plate in the fridge while you mix the filling.
In a large bowl, add the eggs, pumpkin, evaporated milk, sugar, maple syrup, pumpkin pie spice, and salt. Beat until the mixture looks smooth and even. I scrape the bowl once to catch any pumpkin hiding at the bottom.
Take the chilled crust out of the fridge and set it on a baking sheet if you like. Pour the filling in slowly so it does not splash over the edge. Fill it close to the rim, since this filling does not puff much.
Bake at 425°F for 15 minutes, then lower the heat to 350°F. Bake 45 to 50 more minutes, until the crust is golden and the center is set. If the edges brown too fast, cover them with foil for the last 15 minutes.
Move the pie to a wire rack and let it cool for 1 hour. Then refrigerate it overnight, or at least until it is fully set. This rest is what gives you clean slices instead of a soft, wobbly middle.
In a small bowl, beat the cold cream, confectioners' sugar, maple syrup, and pumpkin pie spice. Stop when you reach stiff peaks. Pipe or spoon it over the pie, then sprinkle on pecans if you like.