I use the solid brushes, not the soft ones. I've also got a pretty steady hand and have been using a tablet for a while now. If you what the speedpaints though you'll see I co stanly redo lines or, if I cant seem to get it right, I draw the line somewhere else and edit/drag to the area it should be.
Usually like anywhere from size 6 to 9 for chibis. And I haven't forgotten about them, I have other things to do then RP. c: I'm on my iPad right now so I can't draw and notes are hard to do. I'll try to send one later. c: