You need to learn how to isolate limpers and raise like a man while you're at the nano-limits. It's a bad habit to get into. Stop doing it with any type of good hand. Limping behind is okay with hands that play well in multi-way pots. A9o is a fold for me unless I'm opening with it. I raise with KQo from LP in a limped pot just about every time. Think about it, what are they limping with? You're ahead of their range a majority of the time so why not raise, isolate a limper or two, and take them to value to town when you hit a hand.