I went through this for a spell. I got in such a funk that I would try using my putter from well off the green, which worked maybe half the time, but not very well.
Tension is the ultimate killer. That caused me to decelerate. The club head was getting ahead of the hands and all sorts of horrible things would happen. Even on the shorter swings, the club head should be accelerating through the ball.
You have enough to think about already. lol