How to avoid PIP;
1) only use gear with super high concentrations
2) only use UGL gear
3) only inject into the smallest muscles, except for calf and pecs
4) always train the muscle you inject the same day, with lots of reps to achieve maximum pump
5) always use the biggest needle you can find, so that you can inject the oil as fast as possible, maximum 5 seconds should be the goal.

Once you've tried this, and then go back to Pharma grade gear and pretty much do the opposite of this list,
You'll never complain about PIP again.