currently i use a 21 g( 1 1/2 " ) pin to draw qv test and use a 25 g 1 inch for most injections. it seems that when i try to draw the test, it is really hard for me to get a full 2cc drop in the pin. do you guys recomend using a diff size. i used to use 21 for inj. but 25 is so much better for me,,,, let me know what u guys think.