I used to play a standard 19/15 game, got kind of bored with it and my winrate was very mediocre and my swings were huge. Then in February I experimented playing much looser and more aggressive, and now play about 24/21 overall. Not only is it a lot more enjoyable to play, it's been a lot more profitable as well. It could just be variance, but I doubt it. I generally play 6 tables with good game selection, fwiw.