Yamaha DTXpress/DTXplorer/DTXtreme

I set up my new DTXpressII kit yesterday.  I've been having trouble 
with the hi-hat pedal.  It's not sensitive enough.  It seems I have 
to give it a really good clip for it to acknowledge I'm moving my 
foot.  Especially when I'm doing a rhythm on it -- sometimes it will 
not read, sometimes it will give an open cymbal sound, sometimes a 
closed cymbal sound.  I can't have that kind of randomization going 
on!

I tried adjusting the sensitivity screw on the front.  It helped, but 
still not enough.  Any ideas to help me out, or am I going to be 
forced to play hi-hat rhythm by lifting my whole foot rather than 
rolling on the ball of my foot?  OR do I have a defective pedal?

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