what needs to be remembered with hydro's is when going up oil is forced thru a ball valve that is pushed up by the oil being pumped. this is done so in the event of pump/pressure failure this ball valve drops back into place to secure this oil pressure thus holding lift in place. on all of these ive worked on there is no up valve for this reason hence no top speed up adjustment. this is why there is a down speed valve control and speed adjustment.