I hate to break it to you but the most fish are BY FAR on stars/tilt
this ^ isn't even close to being true
OP, I'm not sure you'll find much action for the type of micro SNG's you're playing on other sites (I don't know because I don't play them), but for micro cash as others have suggested, 888Poker, Ongame network are both real soft (as is PKR from what I've been told, but have never played on that site myself).
Same goes for micro/low buyin MTT's, Ongame & 888Poker are ALOT softer than Pokerstars.