you will get used to the pain. I did. I suggest shooting less more frequently, but its a pain in the ass. I tried cutting it and I really did not see any difference and I really could not understand the where the benefit would come from. I also wondered about injecting more oil in my body and creating more scare tissue.
Your body will be accustomed to it over time. My injections for the most part don't hurt at all now entering week 10 on monday.
Relax a bit and the pain will go away. Massage it after the injection and use the muscle. Inject in the morning and you should be good after week 3 or 4. Load the needle and night and shoot right before work.