To have consistent putting you need to have a consistent rate of acceleration with your putter. When we hit a putt and we have a rapid acceleration rate the putter comes into the ball different each time. Here is a wonderful drill for you to practice. I have a penny that I am going to put on the back of my putter. Now I am going to makes some strokes back and through, and the idea is not to have the penny move. If I swing the putter back and have a big rate of acceleration I lose the coin. So your job is to make some strokes back and through where you do not chance the rate of acceleration, but you have constant acceleration at a constant rate of speed, not something where you are making it accelerate too fast. Here is what it would look like with a putt. Stayed right on there, the coin stayed on the putter and I made the putt. Now if I were to accelerate on the downswing the putter is going to come into the ball differently every time, I have a hard time controlling my distance, I am going to be unpredictable in my putting. Give this drill a try, you will be surprised how good your putting gets in a short amount of time.