so i've been tattooing with rotary's now for about 2 years now. off and on.. just got my bishop a month ago.. every once and a while some tattoos would come back healed like shit... real bad. it seemed to always scab where the black and the color meet the most.. i dont know why. not all of my tattoos come out like this. just a few every once in a while. my tattoos with coils never have done that...
my questions are...
1.how far should the needle hang out of the tip of the tube?
i really dont feel like it is hanging out too far.. when it is barley out (in fear of going too deep) it feels like i'm going over the tattoo too much to make it solid....

2. does voltage matter? i know it does.. i run my bishop at 9.5, around there.... the machine gets hot...

ive been using curved 15 mags mostly.. 13s as well...

i dont know what to do. i dont want to go back to coils.. they have been alot of trouble lately. just not as smooth as the rotarys...
most of the tattoos on my profile are done with rotarys and have healed fine. just those few that really bother me.
any advise?