I have just finished restringing my Freshadama necklace and and didn't have to use any doubling of knots.
DwightSchrute, I think maybe PP drilled your pearl holes larger than normal to accommodate the nylon thread you had requested.
I think you should get some 30# PowerPro (see Artbeads.com for that; they probably also carry gimp and wire needles) instead of doing any more doubling of knots, and move the large-bore pearls to the end again.
I did not teach DwightSchrute to use the double overhand knot method because every time I try it, it tangles, and the knot doesn't form smoothly-- I get a misshapen knot, sometimes with a loop sticking out. Probably just bad technique on my part, but if I can't do it, I don't teach it.
I'm going to upload my restringing thread momentarily in the Lowly Beaders Club forum.