When I originally discovered a few months ago that none of my PDFs from this site where showing up on Google Scholar I dug around and discovered in Google's Faqs that it helps to have links to the PDFs of papers. This seemed strange since I had links from my blog and that is run by Google now so it was weird that those did not help. But I added some more links here and there and presto, now the links to the PDFs are showing up inside Google Scholar results.
Mind you, not all of the PDFs have shown up yet and I have no clue why some did and some did not, but this is part of my continuing effort to free up my past publications. Good start. Not done yet, but getting there.