Quote Originally Posted by Michael R 1974 View Post
\ As the pH is increased to the isoelectric point of the gelatin, the gelatin becomes less positively charged and thus has less of an attraction for negatively charged thiosulfate and silver thiosulfate ions. .
This is where you are wrong. You equate this to swell, wash time and charge. Charge does go down as pH goes up, but swell goes down as does diffusion.

Photography is full of chemistry, and the best I can say is that there is a lot of bad or approximate information out there.