When I am working with people to get better at single pin picking I always suggest that they redefine the goal away from actually opening the lock.
This seems strange, right? It is, but we often get so hung up in opening the damn things that we forget to learn from them.
Rather make your goal feeling a single pin set. Just one single pin. Set it over and over until you can recognize it in your sleep.
Next back off on your tension until you can feel it when it is more subtle. Remember, you are not opening the lock. Just feeling for a single pin to set.
Keep backing off the tension until you can just hardly feel it. Only then start working on the other pins with the goal of opening the lock.
I hope this helps you. Good luck, and keep picking!