We have swaledales, with gimmer hoggs you usually heat them up and bend them out like you said, altough you don't usually use a blow torch, as in you don't use a flame, I can't think of their name but like a hairdryer! If they're causing no problem now, leave them until the horns get bigger and stronger, then saw the ends off with a hacksaw or something similar, if it is the ends causing the problem. If they're just tight bend them out now, as to causing them pain, I don't think it does heating them, it will be a bit uncomfortable, but not like it will be in the long run.