I think the steps are a great way to try and win a seat into major poker events or bigger buy in tournaments.
To be honest I haven't played to many of the step events, so I don't have any real specific advice to give.
It sounds like you are on the right track with playing tight early, and when people start to get passive in the later rounds out of fear, taking advantage of that passiveness.
I'll see if I can't our sit n go tournament and mult-table expert (
SNGPlanetMark)to give you some tips for the steps tournaments.
Jason