if players tighten up, raise more, but raise smaller, sometimes you don't just have to shove all in. minimize the risk, because when tight players 3bet you, they probably have a better hand than you do.
if certain players are attacking your 3bets, start opening a little tighter, and calling a little wider. or in some spots you can just limp, and take the 3betting weapon away from them.
hope this helps, but every situation is different, i'd have to wrtie a book to cover all the stuff you need to know to get really good!
post the games you play, i'll have a look at structure.