With Prop and Mast make sure you don't have any beads of oil dripping down the needle when you inject, warm the barrel up under your arm pit for a minute before you shoot.
The knots are normal and we all get them, I never get them in my delts, but its a size thing when you shoot smaller muscles.
Bulletproof
PLEASE DON'T SOURCE CHECK ME. I AM NOT A DR, DIETICIAN OR SCIENTIST. MY ADVICE IS BASED OFF OF ASSUMPTIONS.
Nothing is impossible-
"Whether you think you can do it or don't think you can do it, you are probably right" - Henry Ford via Jay Cutler, 2011 MD post Olympia Loss to Phil Heath