The Fourth Key:

What’s your putting stroke like? You must consider this because depending on your wrist action, it will dictate what type of grips you need. Players with more of a pendulum action will choose wider or fatter grips to inhibit any unwanted wrist action. A golfer who has more wrist action in their stroke will prefer smaller, thinner, more traditional sized grips. As these are believed to promote a smoother release of ball.

The Fifth Key:

Look at your stroke path. Do you have an inside-square-inside (small arc) path to your stroke? If so you probably have a tendency to pull your putts and will benefit from what’s known as heel shafted model putter. If you’re more of straight-back-straight-through stroke you will have more of a tendency to push your putts. You would then benefit more from a face balanced putter with weight dispersed evenly in putter head.

With that being said, go get yourself a properly fitted putter. Every golfer knows good putting is essential and you’re leaving yourself at a huge disadvantage by not using proper equipment!

Your problems won't go away just by buying a belly or long putter. As with all aspects of game, it requires practice. Like anything it takes a lot of work to do extremely well and get to where your mind will totally believe in it.

It is important to get properly fitted for a belly or long putter. You can't just extend shaft of your standard putter and expect it to work right. The head is too light and shaft too flexable. The heads of belly and long putters are much heavier and have special shafts to handle extra length and weight. 

A simple to way to measure for a belly putter is to attach a string with a weight to middle arch of a pair of glasses. Take proper address position with ball off left heel or left instep, shaft at 90 degrees with the sole of putter flat on ground and butt touching your belly with medium pressure and see where string hangs. The proper shaft length should put string one inch on inside of ball.

As always fundamentals still apply, starting with alignment. Alignment must be correct for backstroke and forward stroke to follow. If alignment is bad, other two will be bad also. 

Now to big question. Should everyone go out and switch to a belly or long putter? NO! If you are a good putter, don't mess with it. In other words, "don't fix what ain't broken." Most players would have a good or at least better stroke if they just allowed it to happen. We get in way by trying to manipulate putter on right path and steering it to hole. Just let putter do work.