Haha damn, I kinda regret setting both to Mean now. The mini games in DR1 weren't that hard for me even on Mean difficulty, these are a bit more difficult I guess? Is it the same as DR1 where you can change the difficulty after clearing a Chapter?
I've only finished the first case in DR2 but I found it pretty easy even on the highest difficulties. The only thing I struggled with was the dumb rhythm game and one piece of testimony. IMO you should go for the highest difficulties on both settings. That's what I did