As far as tape goes, it is what ever works best for you. Just remember the goal:
you are looking for a good fit that allows you to have a relax grip.
I have seen the tape tier method, tape on front and back, tape on the side. I also see tape up to the top or 1/4" below the edge of the thumb hole.
I went through several items with my daughter and she likes the Turbo Shur Cushions. I like white tape on the back. At one time my thumb hole was tight as possible and I would put easy slide on my thumb.