Welcome to the boards!
If this is your first finger tip ball then the drilling is what he felt would be best for you. As for the weight hole,it serves 2 purposes. 1)It makes the ball legal for sanctioned leagues and tournaments(Not all balls have weight holes) or 2)It will make the ball react in a paticular way(In your case stronger). Their are no known issuse that I know of by adding a weight hole.
I believe your PAP was guessed because you had no previous finger tip experience(Don't hold me to this) and as far as drilling and grip prices go,it sounds about right depending on where you live.
I would suggest getting a coach to help you control the hook and join a practice league would be great as you usually get either free bowling or discount bowling coupons to use during non league time.
Zothen
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