what size pins are you using i use 23g by 1 1/2 inche never a problem for me
Agreed. You're probably using pins that are too small. Once I stopped using 25 gauge needles & began using 23 the amount of painful injections I gave myself were cut down substantially.
Who's Test/Deca is it?
Its not the juice the pins sometimes are dry and they dont move well cause of friction. Try putting some gear in the pin and cycling the plunger up and down a few times so it gets lubed up some and maybe moves better.