Preheat oven 350 degrees F. Spoon out the flesh from the sweet potatoes and discard the skins. Measure out two cups of sweet potato and add to an electric stand mixer. Add the sugars, eggs, melted butter, vanilla, bourbon, cinnamon and salt. Mix on medium speed for 1 minute. Slowly add in the heavy cream, and beat on medium high speed until fully combined. Pour into the unbaked pie shell and bake for 35-45 minutes, or until a tester comes out clean. Allow to cool.