like everyone stated before, if you do resort to heating your carbon arrows, it could damage them. they can be heated slightly, but probably not enough to do what you are looking for. i do not believe they have to be lined up with the fletchings, if that is what you are talking about. to truely get your bow tuned for a fixed blade broad head, the best way is by shooting a field tip, then a broad head. see where they hit. some people do not have to make any adjustments. if they are off though, the best way to do it, as ive learned over the years is to adjust your knocking point and your rest accordingly. you want to bring the arrows together. your bow should be sighted in with the field tip, so adjusting the sights is not called for. when you shoot your broad head, if it hits away from the arrow with the field tip, you must change the knocking point (up or down) and the rest (left or right) accordingly.