I've never lost any sleep in overinflating a tire on a hook bead rim. I run my 700 x 32c tires a bit over the recommended limit (around 5 psi). When exceeding the recommended limit, I pump the tire up the night before and see what happens. I figure if the tire doesn't blow off the rim, I'm good to go. In any case, I wouldn't go more than 10 psi over the recommended limit. YMMV obviously and blowing a tire off the rim is no fun.