I'm not an old pro, but I did stay at a Holiday Inn once...
There was an article by Asbell in the recent Traditional Bowhunter in regard to elevated rests vs off the shelf shooting. It had a good explanation on POI (Point Of Impact)and how it's directly related to your first finger/knuckle thereof when you hold the bow. Nicely illustrated too. The article is more enlightening than my description of it...
Seems to me it has a lot to do with how your bow's grip is designed and how it fits you. Example; I shoot two bows off the shelf, a Kota Prairie Swift and a CM Hunter 56. The Kota is designed with the arrow extremely close to the hand, the CM somewhat higher.
The CM has a more natural feel in regard to elevation to me than the Kota. In fact, I have to conciously raise my hand slightly higher when shooting the Kota.
If I only shot the Kota, I would adjust quickly, but the hold just doesn't feel as natural. I primarily shoot off an elevated rest, so this hold/sight picture may be related to that.
Both the 56 and Swift shoot extremely well, each simply requires a different hold/sight picture to
put the arrow on target. If I miss with the 56 I tend to shoot over, while a miss with the Swift is invariably low...