22G is way too thick. you are nuts.. when i first started some genius told me to use a 23G 1.5inch so i listened and it did the job, especially on thicker oils like primo for example. but generally 25G and 1 inch will work. I even use 29G if i am injecting a small amount of gear, i don't recommend this but it can be done.. some TRT clinics use slin pins btw.