For me, it was getting my weight transfer and the "handing it to the basket" motion down. I'm a spusher, too, for the most part. When I'm off a bit, my keyword is "forward". Reminds me to keep everything in a straight line, which usually leads to chains.
I do this as well... I try to keep my putt velocity the same anywhere inside the circle... It works great when im on line. I never really have a hard time getting to the basket but I am usually off to the right or sometimes left but that is less of a problem.
The biggest problem for me seems to be hitting just the top rim of the basket and donking the putt. When I try to focus on a higher chain link all my putts hit the chastity belt or go over the top. Then I am left with 15' comeback putt that at this point is far from a gime for me. :wall: