lol that's a lot of coil machines. i think you gave away a secret when you said "if you don't know how to tune, and then fine tune a machine, you will never achieve your full potential, and not get the best from your machine..Simple as that". you should learn how to tune a machine, man. wow... that must have cost a fortune... seriously, learn to tune a machine. most tattooers i know can make anything run like a dream.