Yamaha DTXpress/DTXplorer/DTXtreme

I hate my HH-60. I find it challenging to achieve consistent behavior 
and it seems to make a world of difference where I put my foot on the 
pedal and how far away from me the pedal is placed. I like to be able to 
play a closed hat and lift my foot and get a brief open splash. This 
only seems to work about half the time. I just can't always spare the 
concentration to assure that the pedal is laced just so and my foot is 
in just the right spot, etc. It can't possibly be me since my technique 
is always impecable.  Har. Just thought I would get this off my chest.

Anyway- what is the exact purpose of the height adjustment on this 
device? What results can one expect? ( I know I can mess with it- I'm 
just curious how others set theirs up.)