Oh the joys of sensitive skin :/
Here' a few things I do, and it helps a lot, I use men's razors, they tend to be sharper than the ones for women, and if you can find hair conditioner for sensitive skin try that. The razor glides smoothly over that and helps lessen irritation. I've also found that shaving after a quick soak in a warm bath softens the hair and makes shaving easier. I can use the men's razors with multiple blades, but you could try going to a 2-3 blade. I've never been a fan of schick razors, I have to go over the same spot numerous times to get a smooth shave and that causes irritation. (Sometimes putting lotion, even the sensitive skin kind or eucerin and aquaphor can sting after a shave) Try something like a natural unscented oil if needed.
I hope I gave some tips that can help