Here's an interesting question to the crowd. What is 'stick' and why is it important? How do reconcile sticking with avoiding chasing hands?
My present take- 'stick' involves fixing a point of contact with your pressure and position. If the other person has decent position and pressure you stay with their pressure as it comes (absorbing) and eating up their space as it goes (expanding). If they lose/change position or pressure in this equilibrium they break stick if your position and pressure are constantly good- this is how holes come in poon sao. This idea expands in application when you 'stick' and move behing a fixed point of contact, keeping your position/pressure ideal, while destroying the other person's advantage- for instance, in basic poon sao, slightly shifting your weight to your right leg while maintaining pressure and 'sticking' at the wrists, creating a shallow angle with which to wedge into the other person, destroying their positions by jamming them into one another and collapsing them, having kept them 'sticking' for instance to your bong- using the friction of flesh contact to pull them off center as you go in.
Training stick- these days I try to stay at the wrist. When working technically, static friction on wrist to wrist contact should not be broken.
Just some thoughts,
Andrew