For a typical injection, lets say sus in this example, when one cracks open an amp and draws out the liquid and then injects, how much am i loosing each injection.

I know that I'm loosing a couple drops still stuck to the side of the amps and then again in the tip of the syringe there are a few drops that i cannot empty without an airlock method or approach to injections (which is uncomfortable having a 1cc air-bubble in your ass).

Would this be something to be concerned about, especially for a high concentration substance such as sus.