Big Bubbles whe aspirating...

[RADAR]

Use the bubble to your advantage, it helps get all the oil out of the syringe, and stop before you push the air in, even then you can push the air in wont really do shit.

Absolutely....You are shooting into muscle tissue so the body will slowly absorb it. I always use a tiny bit of air to ensure that i got all of the juice out of the needle.