One thing to note, a lot of the times, lower tuned sounds louder to the ear.
It's all a matter of personal preference really.I've had several boxes tuned high 28's and low 30's, and I didn't like them that much.I personally like the sound of boxes a little on the smaller side, tuned higher (most of the time).Mostly due to my taste in music.
Just play with different boxes, all that I can suggest.Play around until you find the one you like.