First I would check to see what the true angle of the lug is, often what is posted is not 100% accurate. It is quite doable to alter the dimension of a lug 1* or so, but I would not braze it first and cold set that angle. You can grind a little bit out of the inside of the lug and use a couple of boom tubes to slowly bend the lug to your desired angle using hose clamps to keep the lug edges in contact with the tube. If you lug happens to be a stamped lug, then you will have no issues bending it into position, a cast lug will make you do a little work. Hope that is helpful.