Whenever I injected (I've only done one cycle), I would draw out the liquid, remove the pin from the bottle and push out all the air. I've been told that you can also leave about half a CC or so of air behind the liquid in the syringe and inject until all the liquid is gone. When all the liquid is gone you should feel a "pop" and that way you know all the liquid is out. Has anyone tried this?
I never had problems pinning my glutes and delts. I would rarely get any blood coming out after pulling the syringe even. However throughout my entire 8 week first cycle, injection would go fine, but 3-4 days later the site would become tender and swollen with pain. Never hindered my lifting or strength though. I was Injecting 1 cc twice a week. My glutes and delts would hurt for a good 1.5 to 2 weeks after every injection.
I don't think I was doing anything wrong, but I am a bit concerned as in my next cycle I will be injecting a little bit more volume.