I just stay loose, comfortable and easy. I think of the pace I want the ball to travel, then picture how far to the right or left the ball should travel around the hole. The bonus is when, and if, the ball falls. There is really no right or wrong way to stand or set up. If you follow the sport, you know there have been many successful putters with radically different methods.
Consistent putts stem from consistent, solid strikes on the middle of the clubface.
A solid hit is something you can usually hear and feel. So don't change your stroke too often, just try to meet the ball solidly. Whether that tempo is fast, slow or in between, it's important to think of the back swing and swing through the ball. It's a natural impulse.