I never did season long testing. I did hours of testing on a game by game basis. That's where I saw improvement. I haven't updated the newer rosters that I have downloaded ad yet, but hopefully in the next couple of weeks I can and I will run a couple season sims and report back. Did you set sim for 20 mins?
I honestly can't say what's a better foundation or what's not, but I know that these edits have improved the diversity of play between teams. My main concern was that every team seemed to play the same. Please test your theory and post results. I'm up for anything that improves the game.