What machines are you all using? I've been using a Mast P20 for powder brows, lips and eyeliner and I'm not loving the results. Pro's are it being lightweight and cordless but I dont feel like its giving me good results. I'm getting really bad vibration on the needles (mast needles) and no pixel effect. I wouldn't trust it for nano hair strokes. I feel like the vibration is causing more trauma than implanting.