I generally run my 32's (which measure 29mm on Mavic Open Pros) at 75-80 psi rear and 70-75 psi front. I weight 155 lbs., the bike is 25 lbs., and I generally carry 15-20 lbs. of gear on the commute. I ride gravel roads, ride off curbs, blow off potholes, and hop up curbs all the time complete with a rack and panniers and have yet to pinch flat. I think you're fine if you're careful but I'd go up 5-10 lbs. if you're going to ride aggressively.