I remeasured my index finger from the base between the middle and index finger and the length is 69 mm and the outermost line in my second to first joint is 18 mm. Have i grown at adult age or has throwing pulled my fingers longer like the Spanish inquisition? I have gotten 17 mm before for the middle section length measuring from the same spot with the same tape measure stretched straight. Maybe i'm growing to the challenge of throwing wider discs
I have not had enough help from sports tapes plastic or paper based once the skin is peeled deep enough then rest is the only option. While slipping is harder on the skin than ripping squeezing tight can damage skin for new players.
I heard that Jussi Meresmaa could not participate as a thrower in the world distance record breaking attempt competition after he won the Big D 8=world distance throwing championship because the skin on his index finger split. He is a long time throwing veteran with a lot of power so the skin can be subjected to a lot of stress with powerful throwers. So he participated as an official running to catch the discs to measure how far they went.
It is normal that most players need to develop their skin thickness and toughness (happens automatically over time) for months to one year+. Reducing the amount of throws helps too and yes i know and remember how that can be hard especially when you get breakthroughs. A smooth disc won't abrade the skin extra so picking where to grip plays a part too and you can sand molding imperfections (protrusions) from a disc and it remains competition legal.
Grip wise i would not change anything necessarily if the grip works flight wise. I would like you to test your theory about gripping less hard. Loosen too much and the disc slips to the side too early. Grip too hard has not been a problem for me usually
It is damn near impossible and usually grip strength is the least of the grip lock causes in effect.
Another way to extend the sessions is to vary where the disc touches the skin and you'd get the double benefit of getting to experiment with all kinds of grips. There are millions of possible variations.
Flat shots need running on the center line of the tee and planting each step on the center line. Anhyzer needs running from rear right to front left with the plant step hitting the ground to the left of the line you're running on. Hyzer is the mirror of that.