Based on your stats, your preflop play is very selective, and you wait until you have a strong starting hand before you enter a pot.
Based on your showdown percentage, and the fact that you still have a bankroll, it appears to me that you maximized the value of your strong hands, while minimizing your losses with your marginal hands. This would tell me that you did a good job reading the texture of the board and adjusted your play accordingly.
I agree with the others, in NL, I would prefer to win more hands uncontested than to have more hands go to showdown. Based on that statistic, I would say that you should be more aggressive pre-flop and on the flop to try and eliminate opposition and take the pot down on the spot.