I would say that 2ml is a bit much at once, however that is just my opinion. Many people do 2 and feel fine with it, and as long as it is not causing you any issues continue doing it. Just rotate it around and make sure you are giving them rests before you inject again. One side per week should be fine.
As for aspiration I would try to get that down. After you have done it enough times it will just come to you and you will no longer worry about moving or snapping the pin. Before you push the plunger just take the nail or corner of your thumb and pull up on it while having a firm grip on the syringe. Only a few things I cannot stress enough here is sterility and aspiration!
Yes Angel, YES!
nothing sek-c-yer than a wimminz talkin about juicee....ahaha!