I have found out that when paper tuning a lot of your where your center shot lands is related to where your arrow bisects the berger hole. On my hoyt am 35 if my the center of my arrow is in the center of the berger hole my centershot would be around 7/8" to 3/4" of a inch. With the bottom of the arrow lined up with the middle of the berger hole my centershot tuned in at 5/8" of a inch. With my hoyt the higher the arrow was on the berger hole the closer to the riser my centershot was, with the arrow lower on the berger hole, the arrow tuned more away from the riser. On my bowtech guardian it was the opposite, the higher I went with the arrrow and nock point, the arrow tuned more away from the riser. Each bow is different in this regard I believe.
And this a function of cam lean, or actually limb twist.
I think that paper tuning is a great tool because it can make these things apparent, while other methods don't at all....except maybe bareshaft.
The more the limbs are twisted the more it effects where the center ends up. The only way to get centershot in the dead center is with zero limb twist and very accurately built riser, pockets, limbs and cams.
I prefer a bow that tunes close to center, or is at least able to be made to shoot down the center. It means that there is less lateral nock travel during the powerstroke and
has to make a bow easier to tune, not to mention being able to tune well with a broader range of arrow spines.