Very cool that the early limping strategy is working well. In general, I like to limp or minimal raise from early position, since I want to get into a situation where someone is willing to pay for cards to try and outdraw me. Then if they hit their smaller pair, they're willing to bite on a bigger bet at the river. There is always the chance that they will outdraw you, but pocket A's or K's should only get outdrawn 10-15% of the time over the long-haul, so it is the best strategy. You just have to take the bad beats in stride and keep your eye on the big picture.