Since you haven’t been poking for years and years. Supposing carrier is good for you. Some people have problems with some oils. Everything else is good to go. It could be pressure from 25 to 27 g pin. Have to push slow. I get “knots” from trying to push fast, inadvertently flexing muscle or cramping up and losing my focus. I have and really continue to use 22-23 g 1-1 1/2. The delts get touchy after a couple years as well. I used to be able to put 2, even 3 cc in each. Now, 1-11/2. Also, in my opinion, mixing different compounds especially if they are long and short or like gso and Mct in same syringe seems to hurt me more. I and others use to mix everything for the week in one vial! Now, I don’t do test cyp, EQ, Npp in one syringe.