The stiffness in the flex could definatly be the reason for the fades. So, demo the 3w and see what happens.

Why didn't you demo the origional driver before you bought it? Taking someone's advice - especially the seller's. Anyone willing to sell clubs should always allow demo's. If not, then go to the next seller that does. You can always go the person with the best price afterwards. (I'll get off my "told-you-so" box....sorry)