Try out different methods to find out which one suit you better. Maybe you’ll do better with the hoovering the putter head behind the golf ball.
I had never heard that Nicklaus hoover his putter head behind the golf ball. I did hear that he lift the putter and then lay it gently down to get a feel of the weight. Also he is known for lining up his eyes behind the golf ball. It’ll give him a better view to line up the putt, although he has to be conscious of giving a little more effort of keeping the putter down the line a little longer.
If you are good at playing pool or billiard, the putting process is similar. Not a strike as the full swing, but to just start the golf ball rolling down the intended line.
You will eliminate the grounding of the putter behind the golf ball if you don’t shift weight back and forth, and not striking the golf ball but a push. Like you’re sweeping the floor with a broom.
The more you practice, the more putt you will sink, the more putt you sink, the more you will make. I used to go to the practice green after work to putt for 30-40 minutes before going home.