If my putting is off I'll try sbst, back with the left hand and through with the right are my only thoughts....but I don't think it's possible to do sbst, seems like there would always be an arc. I have gotten away from being mechanical, lining ball up with Mark/logo, etc. And trust my ability and putt naturally and I'm starting to trust it. My natural stroke is more of a cut acrossed the ball, which isn't text book but I feel more free just getting up and hitting it!
If I had to do one or other it would def be sbst.