So as far as the syringes go, you just need to get a 27-28 gauge 1/2” 1cc needle. I use a 27 gauge myself, and it draws up very quickly, and injects into the muscle just as easily.
Not sure about androgel. I’m pretty sure that stuff is junk though. You can definitely do a testosterone cream, and apply it daily. Many men are using testosterone cream with great success lately.
HCG can help with penis sensitive in some guys. It’s not that common though. Most guys notice no difference on HCG. But there have definitely been a few that reported it increased things sexually for them.
I would still try increasing your injection frequency, before adding in HCG. Insulin needles are legal to buy. Just grab some off the internet. They’re cheap as hell too. Stabbing urself with a 23 gauge 1” needle is what guys were doing 10 years ago. Luckily we know better now. I definitely wouldn’t be injecting EOD if I had to stab myself with a harpoon like that lol. But inject EOD with a 27 gauge, 0.5”, 1cc insulin syringe into my quads. I literally don’t feel it. And no pain at the injection site afterwards. I could easily inject everyday if I needed to.