How do YOU practice with Custom Training?

I have been using custom training packs more frequently recently to, hopefully, become more consistent with specific shots and common situations in-game. After a while, I did realize that its just as easy to autopilot and mindlessly repeat the same shot over and over, which is obviously not going to be any helpful.

Since that realization, I have tried to focus on each and every shot, think through everything, and while it has helped me be conscious of my inputs, it only made training more exhausting and frustrating, and honestly, I haven't been seeing any results.

How do you ensure you're training effectively with training packs? How do you make sure to get the most training possible from them?