Btw, I really appreciate the work you've done on this topic. It's nice to see someone giving careful scrutiny to all the common notions people have about yeast rinsing.
And just to pass something along, Ive been repitching unrinsed slurries for a couple years and while I had been getting overall better results than before when I rinsed, I still noticed that by generation 3 or 4, my ferments would become less and less vigorous. I very recently started using Wyeast yeast nutrient and its made all the difference. Im on generation 5 with 1056 and each ferment so far has been super consistent in terms of lag, vigor, length, size of krausen and attenuation. I just wanted to share a solution to something that had been driving me nuts for years.