Your swing looks great. You got a lot of time in on it and it shows. What was your handicap when you started? If I am lucky I play once a week and then practice 2-3 at the max with some at home practice.
I think a putter fitting is very important. For two things:
Aim. Most people can't aim the putter(s) they own.
Distance. The weight distribution in the putter greatly affects how well you can hit putts the proper distance.
Thanks, interesting, and not surprising. The marketing myths in golf equipment aren't unlike so many consumer products, yet I fall for some of them.
Kind makes me wonder why so many folks here stress how important a putter fitting is. I know what length feels comfortable, I can see if the lie is reasonable and I can decide for myself if a putter looks, feels and putts "right" to me. For now I'm going to see if more practice cures my inconsistencies with my old putter.
My experience says no but I suppose some change in mechanics could bring about more distance. The major component is your athletic ability. For example, I started playing and hitting my PW 100 yards. I purchased new irons and was up to 130. Again I purchased new irons and and the PW is 140. My swing and lag has progressed considerably since I started but I am very athletic and aware of my biomechanics and body position. Unless you are making swing changes, or don't understand where your power is generated, you will not gain much distance.