I am getting ready to try my hand at wheelbuilding. I've had the misfortune of breaking 3 rims in the past due to spokes pulling through. These have all been on the rear with single gauge 14 spokes, and have included rims from Mavic, Ambrosio, Matrix. I weigh about 180. My question is what is the best way to prevent this - larger spoke counts (I've been using 32); DB spokes that give more; or a tougher rim? Thoughts?