I recently switched from insulin pins to 25g needles and I've noticed a couple things. First, it is a lot more difficult to pierce the skin with the 25g. And also I have been losing more oil from the injection site then I was with the slin pins. I never used to lose any, or very rarely a minimal amount would leak out, now it it every time I inject im losing oil and its kinda pissing me off. Could someone explain the z-track incjection techinque to me as I think this minimizes the oil lost. Thanks for any help fella's.