First, if the coach doesn't give you his/her undivided attention for the full hour (perhaps 50 minutes if that's their quoted hour), then you have every right to complain and demand that they spend the entire hour with you...not running the pro shop. Refuse to pay, except for the time being coached.
Most of the coaches I've dealt with, will do some type of bundle, do 4 lessons, the fifth is free. I pay $40/hr, but my coach is there the entire time. Even if someone comes up to talk with him, I still feel I get his attention when needed, and usually we go over the hour. He won't do more than one person at a time as it distracts from the lessons.
A lot of coaches will coach high schoolers for free or at a reduced rate to help build the sport. If you continue to work with this coach, make sure he understands what you want to accomplish and what you expect from him/her as far as their attention. Also, when you started to have issues with your thumb, you should have gone back to him and talked about it. That discussion should have been at no cost. If this coach isn't or won't adhere to these few principles then I would suggest a different coach.
You seem to be progressing, so coaching would probably serve you well, provided the coach is serving your needs. The Aura Paranormal, from what I know is a good ball. Although it might not match up to your game or house shot. A coach is a very good source on suggesting what ball(s) will work for your style, lane conditions, and what you want out of it. So are a lot of the forum members.
Good Luck!
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