I inject directly into the muscle that I am going to work for the day. I backfill a slin pin. You would need two slin pins at .75 ml each- assuming a 1 cc pin. The needle is much smaller and doubtful it will leak out.
The problem may be the size of your needle. I use a 25 g needle when using a regular needle. I draw with a 23 and pin with a 25.
I would try to squeeze the area up or push down inject it. It is called the z track method. Look it up on the internet. That should stop the leakage even with a 23 g