Not sure of your weight but that sounds fine. The top end of an 06/07 12M waroo is around 30 so I would expect you'd be fine if you are at least 160 lbs. I would typically rig my 12M (but lately have been riding a 9m in that wind). I am 185-195 depending on my diet.

If it goes over 25 you may want to go down a size.