Your version of full is the same as my relaxed, so like I was thinking we were both talking about the samething, but calling it something different.
I have heard of Mo Pinnel drilling peoples grips with your version of a relaxed grip, I haven't seen anyone use that kind of grip before, or know what is involved with fitting it. I have heard of people having release and wrist problems with spans this short that weren't fitted properly (pitches etc).
I had to argue with my ball driller to get him to drill my grip at a "Full Grip", now he drills most everyone's grip that way. One local proshop drills them beyond stretched and it is a pain to try to coach someone with a grip like that so I usually send them to my ball driller to get their equipment fitted properly before we start lessons.
So back to the arguement about relaxed vs. stretched, I would bet that 90% of the pros use what you are calling a "Full" fingertip grip, thus I am agreeing with you.