[You're No Daisy]

I have no problem with your line. You know the SB is a nit so his range should be pretty tight. If you hit the flop hard, or get a combo-draw, you have a great chance to double up. Have you been raising the blinds a lot. Maybe SB was just getting fed up with you? What's his fold SB to steal percentage? If it's low, and he's as nitty as you claim, then chances are he's got JJ+, AK. That's a pretty tight range. If you whiff on the flop, you can easily fold.

AC