[Bona]

OP, I think I am about as rocky, nitty, variance averse as anybody who posts here. I agree with the reponses so far that you can probably open up a little from MP on but I would caution you that the marginal hands you elect to play should be situational (3% more hands only means 3 in a 100 hand session) and you need to get away from them postflop when they don't improve.

15/9/1.5 is a comfort zone and a moderate winning style in low micro stakes. Many here seem to play at 20+ with good success. I don't recommend going directly to that (adjust your game slowly and incrementally) until you are very confident in your post flop decisions and your ability to read your opponents.

You can loosen up preflop but don't loosen up post flop especially on the big streets. Don't "tilt" away your potential profit increases when those added hands aren't paying off either. In other words adjust your game if you wish but perform the surgery with a scalpel not an ax.