Yamaha DTXpress/DTXplorer/DTXtreme

WM:
You can do a number of things to reduce the false triggers. Among 
them are:
> PHYSICALLY: Wrap a piece of rubber around the cymbal stand where it 
fits into the clamp. Then, fill the tube of the cymbal stand with 
cotton balls or toilet paper. Also, do not clamp the cymbals down too 
tightly. these actions will reduce the vibrations that reach the 
triggers.
> ELECTRONICALLY: Increase the Minimum Velocity parameter to a point 
where slight vibrations are'nt triggering the cymbals.

I would start with the physical aspects first, as the electronic 
aspects mentioned above diminish the playability of the cymbal.

Let me know how things work out.

Stephen