There is no correct way to "aim". Everybody kind of does what works for them. The kicker is finding what your brain and body like. When you talk about using the arrow tip in correlation to the target that is called gap shooting/aiming. Very effective once you learn how much gap to put between the arrow tip and your target whether it be below for close shots or above for longer shots. Now for myself I am more instinctive which means I only look at my target. If I look at the arrow at all my concentration is lost and the arrow is going for a ride! I just have to draw to my anchor while burning a hole thru the target with my eyes and let it go. I take 6 arrows when I shoot and just randomly pick spots in the yard and no measured yardage and take shots randomly as I walk around. Do some reading up on gap shooting or start in close just looking at the bull and when your nailing it everytime move back and few yards and do the same so on and so on. Of course you have to have a consistent form or it dosen't matter how consistent you aim. Hope some of this helps.