Hey Jman,
I am still working with the sensitvity..
However, I did move the large piezo to the outside of the box, about an inch from the edge of the bottom of the ecymbal.
It is working pretty good, I still need to get used to when the edge will trigger.
Also the jack inside there is very very cheap… I had to repair that is several places, I really need to just buy a new jack, and get rid of the circuit board.