I've been practicing stippling for about a year now and I like doing it. I think I like the micro stipple the best because I can see where I've been better. You do need to RELAX and not fight it. I put on an Elvis CD and get into a rythym and just make continuous "S"s and if I need to turn around I make an open ended "8".
You are half way there with your Bernina stitch regulator, just relax and sail along with lazy "S"s. I wouldn't even try it without the SUPREME SLIDER taped to my machine bed and quilting gloves or at least the little rubber things that fit over your fingers.
I'm now trying to learn McTAVISHING. It is long curvy strokes that look kind of like curling hair strands. I'm having a hard time making them even though.
Relax and have fun................