I guess the first thing people want to know is what there power capabilities are compared to 2 coil machines. These single coil machines are set up as shaders and have no problem pushing needle groups up to 13 mags. I personally don't use groupings bigger than that though. I would say there is definitely some difference in power between the two set ups but it isn't drastic. When set up as shaders I like using them for 7-11 mags. I do go to a 2 coil machine when I use a 13, it just has that little more oomph I like. Set up for lining they can perform just fine for most groupings.
As far as the numbers go, wether its a single or dual coil I adjust both with similar numbers. Larry