Do you prefer prop or test E pinning?

Some people complain of pip from prop (I never experienced it personally), but test e is probably the least pip inducing aas around. Unless you get one that is very high concentration (400+ mg/ml). Personally, if I can stay diligent with the ED pinning (and work and life cooperate), I much prefer prop.

How to get rid of Pip?

Definitely rotate injection sites. You might get less PIP in your quads and delts. Also next time you get Prop or any gear that causes a lot of PIP, ask the source if the gear is in Grapeseed Oil. Grapeseed Oil has been known to reduce and sometimes eliminate PIP all together. The Prop I got from my source has no PIP.

Can test prop crash at 100mg?

Test prop can crash even at 100mg, because the chemical structure of test prop does makes it not readily bond in solution, and it doesn't dissolve that well in the liquid. When you inject these oil based compounds into your muscle, they quickly begin to separate and break down.