man, i don't think all of this is "normal"..............i put tren/prop/winny all in my biceps, triceps and delts and never have any kind of "golf ball" welts, no real pain at all. Yes some tenderness if i do prop in a bicep but that is normal.
I think ulter nailed it, its likely your injection technique, or the quality of your gear. I make all my own gear and with the addition of EO even prop is painless as it can be