A degree is 1/360th of a complete circle (wikipedia), or just over 0.017 radians, if you’re feeling particularly cruel.
So 5 degrees is 1/72th of a complete turn.
45 degrees is a “quarter turn”. So you’re looking at about a 9th of that.
Basically, not a lot at all. Small turns. If you overshoot a little, you’ll reduce the lifespan of your laser. If you overshoot a lot, you’ll get exactly the same problem as you’re already getting (and won’t know it) or you’ll burn out your laser. Either way, not good.