There is no height adjustment. Walmart metal meat tenderizer. Cut off head cut in half drill hole and bolt fast...There are a couple things that can be done to help, as you know don't attempt to adjust the pedal it is set at 1mm blow-bye from the factory and that is it.
One way to possibly reduce the length the travel if to bleed the brakes while the caliper pistons are fully retracted and held fully open (blocked), the calipers have a tendency to hold a small amount of air and are impossible to bleed out unless held open.
Another option is an adjustable brake lever, I use a Gilles Tooling lever.