Yamaha DTXpress/DTXplorer/DTXtreme

I want to make it harder for the crash sound to be produced while I 
play my ride cymbal and I'm not sure which of these settings to mess 
with.  Sometimes when I play my ride cymbal extra hard I'll get a 
crash sound due to be vibration towards the edge.  Or if I hit the 
ride at the very top section, close to the bell, I'll get the crash 
sound as easy as hitting the edge.  Thanks for the help!!!

- UN.H