sounds to me like you might need to try a stronger grip. the reason it is better with you woods and irons is because the more loft you get and the steeper the swing path, the less your slice gets. how many knucles on your left hand can you see when you are setup? a strong grip you should see about about 3 knucels. you face is open at impact that is why you are slicing. the ballistics of the ball goes strait becuae you have a good swing path, but then the side spin on the ball kick in after 50yds or so and it starts to go right.