Yamaha DTXpress/DTXplorer/DTXtreme

i looked at some past threads and noticed the disscussion about the 
rhh130 (how on some you must really mash the pedal to get the closed 
sound..which i gather means its defected.)
however, with mine, i get a clean open sound with the pedal open, a 
pretty nice closed sound with the pedal closed, then finally 
a "choked" sound with the pedal firmly pressed (very similar to an 
acoustic hh). Is this a defect, or is it playing correctly?
i kinda like the way it plays, but i wish i didnt have to press as 
hard to get the choked sound. (is there a way to adjust this?)