What speed film are you shooting outdoors? The only shade I have used is my own body (hunched over the camera). And I have never really had any fogging issues. I've shot, 7245 (EXR 50D), Kodachorome 25 & 40 (in regular 8mm), the old Vision 200 72xx stock (not V2), and Ilford 400 all this way.
Was your spool wound at the factory, or did some one wind it down themselves? This can be the cause of major fogging when loading outdoors. All that I mentioned above were wound down by Kodak, except the Ilford and that was done by the recan place we bought it from.