Hello, as I wrote. We use 0.7x40mm needles (length 40mm = 1.57Inch).
Do you think this is an unnecessarily long needle to insert into a muscle?
We always try to go as deep as possible into the muscle, that's why we use such long needles (as recommended by the doctor). And psychologically, when you have to stick a needle like that in your butt or leg 6 times a week, it's not very pleasant psychologically. Personally, I don't like pricking my thighs, because it often happened that I hit a nerve (probably) and almost every time my leg twitched...
You wrote that 25G (0.5x16mm) shouldn't be a problem - yes, it would be a lot of fun to apply with such a short and thin needle.
Personally, I'm around 18% body fat. Do you think 25G would be enough for me to reach the muscle?