Not as long as you're winning! Different people have different styles, and 31/23/2.5 is a bit on the laggy side but nowhere near being a maniac. I know a few regulars at 3/6 and up who do well with those stats (and they are not fun to play against either!).

Case in point: Doughnutz and Bryce from Stoxpoker both play pretty laggy and manage to be successful at it because they're both excellent hand readers. Stox is also a great hand reader but more of his success comes from using passive play as a counter to aggressive opponents who overplay their hands and/or bluff too much. He's not exactly timid, but you will see that he rarely makes outright bluffs and folds a lot more flops and c-bets fewer turns with air than either Bryce or Doughnutz.

I find the Stox style easier to emulate myself because i have a hard time 3betting the turn with Q high or whatever. But I can see the advantages of laggy play in some situations, and so am looking for some spots to make some different plays.

I think the best overall strategy is to keep an open mind to different ways of playing and to try to incorporate the good parts of other players' games into a style that works for you.