[Jean]

actually if you have a big hand, limpers with bad hands don't have the odds to call you, even if you raise less than what you describe. So I don't think that you have to raise this much, unless you really want to take down the pot right now. Sweatening the pot with a big hand in position is certainly something very enjoyable. You'll be last to act after the flop anyway ... so why bother being called by weak hands ? They're just giving away more money to you in expectation, and as stacks are already rather low you don't give much implied odds to drawing hands like small pairs and suited connectors.

As for your theory of the +1BB for an early position raise, I don't get the point. As you're raising in early position, you represent a big hand already, so I don't quite see why you should try to discourage callers even more. Morever with so many players to act behind you, you're not unhappy to commit less, in case you run into a monster. What is your reason to do this bigger raise in early position ?