The machines hit is always the same it hits just as hard at 60-160 on the cheyenne pu supply or on a normal supply either... Only thing that changes it hand speed but because it hits quite hard I think less cps is best doesn't need to hit the same spot as many times I line again on a cheyenne power supply at 70 shade at 80 and colour at 90 or sown times shade at 90 depending on the piece if it's something I'm not sure about il turn it down.. The real trick to mastering black and grey with a hawk start doing ball point pen drawins train your hand and thinking in that technique and you will use it more effectively or even just a 4b pencil which I prefer use just that one pencil no blending tools or anything just that pencil or pen paper and pressure variations along with utilising lights and dark and you will find a cheyenne Thunder for spirit so much easier to use