As you know, you are what you practice.
If you practice hitting soft balls to the forehand of your opponent, little spin and short NML depth, you WILL hit those shots when you're pressured against a good opponent, even if you really intended to hit the lines.
Gotta separate warmup from practice, practice from competitive hitting, and competitive hitting from actual match play.
Often, competitive hitting can have the hardest shots, most speed and spin, and going for the most.
But still, each is different from the other.