Try using the 150 ft scale for shorter putts. If you look up Nivlacs excellent putting primer by searching the forum you'll discover that all the scales on your putter become usable.
I have the Redwood putter and Faterson is so right about it. It has 5 scales and is very accurate. You have built-in putts of 6 6 9 12 15 just using the first movement of the avatar. The Anser putter got me to master and I went for the upgrade to Redwood when it came out, wondering how much better they could make the Anser. WOW. You'll just have to see for yourself.
Before springing for the new putter take your stock putter out, find a flat green and putt back and forth using the different scales. Just because it says 150 ft doesn't mean you have to be a mile away to use it. I use my 150 ft scale for 15-17 ft putts with excellent results. The shorter backswing makes it easier to nail the stroke and the ball seems to roll truer.
As I remember, the scales on the stock putter are 6, 8.5 and 17. It's been a while since I had that so I might be off but you can figure out for yourself what it is.
In the end, when you think you're doing ok with the stock putter, go get the Redwood and see for yourself. "WOW-this is way easier." comes to mind..............gl