As I explore this in my own motion, it seems as if focusing on PP#3 in the hitting area does not guard against throwaway as much as working on thrusting with the focus on PP#1 against the lead thumb. Is it better to monitor #3 going back, then #1 going down and out?
It is the player,s choice. However, I like your choice of sensing with #3PP going back and #1PP coming down. You could study 6-D-0 Power Storage.
It is my belief that the individual senses uniquely their own pressures. But as Mr. Kelley states: "After the slected Pressure Point pressures have been established, the player's prime concern is the storage of the accumulated Power." see 6-D-0
I like your choice!
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Sustain the line of compression,