hello from france ....
I agree with Manfred , dampening a mesh head helps a lot for accurate triggering ...
Dampening the mesh head from the inside (with some foam ring like a REMO muffle
http://www.remo.com/portal/products/2/599/607/dh_muffl_ring.html or something DIY ) prevents the skin to vibrate creating some "sustain"
... the piezo ,who acts a bit like a microphone , picks that sustain , and this "long" signal causes double or triple triggering ...
IMO, dampening the skin , combined with a precise GAIN setting is a good way to go...
So allways try to "feed" the pads input with the best possible signal ( CLEAN GAIN AND MUFFLED RESONNANCE ), it will help the brain to detect precisely ...
this way you can lower the threshold quite a lot ...
I dont own a whole 2box kit , but only the module , as a snare drum ,i use a 12" pearl tom with a DDRUM snare trigger and a DDT mesh head
...that works quite well exept for the rim , i think it is a weekness of any drum trigger on acoustic drum , as the rim piezo and the skin piezzo are mounted on the same shell and are not enough insulated from each other...if you have tricks to share on this ...
I wish you all a happy new year , with a new and working module editor , and a new and more tweekable OS , with presets for other brands hihats , cymbals , and drum pads for example

... and for me a new SD card ... i ve got a bad one

but still enjoy this great module!!!)