Great advices here!
The Hickman 4P's can even be reduced to two basic factors (or building blocks) Let me quote Hardenberger (from a seminar some years ago):Reducing pressure can (if emphasized) move you into a negative way of thinking. It is much better to think positive:We have two raw materials, one is the vibration of the lips, and the other is air. This is what we have to work with - the two building blocks. What happens when something is wrong is that the balance between vibration and air is disturbed. What you practice at the start of your day is to achieve this balance. I almost look at my warm up as a kind of meditation – one take it down to the ”lowest common denominator” and let what is not good slowly disappear.
What do I need to be a better player?
1. good tone (or sound)
2. good endurance
3. good range
Too much pressure will of course hinder all 3, but no pressure will perhaps not give a good sound?