Sometimes against maniacs it is actually good to open up your play a bit. With such passive players you should add some hands that have good value against many players. Additionally, with little raising being in early position isnt as bad. You can add more hands to what you play up front. Also, reading your opponents becomes nearly impossible as they play rags and monsters exactly the same so wait til you get a great hand (like 2 pair a set flush straight etc) and just punish them. Good luck!