I shape all of my thumbholes by hand into ovals. the ovals are laid out from 10 o'clock to 4 o'clock in relation to the centerline (12 o'clock). I leave enough room at the ends of the oval to accommodate 3 layers of tape. The part of the oval where my thumb might rub I hollow out so that my thumb is able to rotate 360 degrees.
As for black tape, I don't know what you are trying to tell me. It is the company that manufactures the tape that is important. As I mentioned, I use the Scotchbrand 3m vinyl tape (3/4" X 66 ft) and leaves minimal residue when removed. I first began using it when my Pro Shop
was selling it over the counter back in the 1980's. The tape is very thin so you can make micro adjustments in snugness. Also I mentioned keeping 4 or 5 colors in the house. When I have 2 or 3 layers of tape that are staggered, removal is much quicker when the tape is of different colors. I also mentioned using a mini-screwdriver to remove tape - it beats a pocketknife which in more cases than not ends up cutting holes in the tape you are trying to peel off and remove.
The Scotchbrand tape is slick enough so that you should not have any rubbing problems unless you use too much tape.