Theres not a lot of difference between the skill of players in the two games you described in your first post, therefore its difficult for a lag bluff the same people off of hands that tight players value bet into. Get my drift?
I'm trying to grasp this but I think a few words are missing in the last sentence, are you saying that a better player is going to exploit the fact that I'm a preflop aggressor? Their going to bet into me knowing that I'll push?

I don't believe I've ever talked with anyone about a lag bluff and am interested to hear what it is? Perhaps I've used it without realizing so.

And as for NL games, do you think that newer players should play limit games? I've found better success in limit SnG's in the past (To be perfectly honest I'm not sure why...), but as for ring games I would have to think that NL games are my best option. Especially since I can make weaker players pay for their mistakes more in NL than in Limit.