What mistakes are you seeing? The 50W blue seems to have more gain than the 100W to me. Also I thought the Stealth heads all had more gain than the 100W on the red channels.
It came from Howard Kaplan who designed every EVH amp except the first 100W head and Iconic (and did work with James Brown a little on the Iconic). He recently left EVH.
He talks a lot about designing the amp in these videos (there's a lot of overlap of course). He does talk about how they added gain at points and how some things were "left that way" because Eddie liked them. And they're also 2 hours long each