[Bozeman]

You should only expect to make a pair (or two pair, trips, or quads) with an unpaired hand on the flop 32.43% of the time, so you are actually getting luckier than average here.
In addition, if you always raise with these hands preflop, you will see somewhat less than this because when people play against you it is somehat more likely that they will have some of your aces, kings, and queens.

33K hands is a rational sample size, but it still will have reasonable expected deviation.

Craig