After relocating several of my stories behind the pay wall, I had a very helpful email (or two!) enlightening me about the effect doing this would have. As a result, I've returned most of them to public access, leaving only the 'Home Schooling' series for Premier members only. These have some of the highest scores and downloads, so they are still worth the cost of premier membership IMHO.
Thanks once again to all my readers, and especially those who vote and let me have feedback.