All this does is mess up a well-grooved stroke and throw off your natural rhythm. The purpose of practice is to make the stroke feel effortless. When you play, let your instincts built in practice take over. Trying too hard to stroke the ball on line or make it, only causes you to tighten up and interfere with your natural stroke. PGA Tour player Larry Mize knows when he puts too much pressure on himself to make a putt.
Some players can trust their stroke better than others.
Trusting your stroke means forgetting about the mechanics of your stroke. If you think mechanics on the golf course, you are practicing the stroke. Don't practice the stroke when you play golf. This is the time to let your creative mind take over. If you can stroke the ball solidly with your eyes closed, you can trust your stroke in a match.