tuff stuff deflator

I also bought some Tuff Stuff Tire Deflators. http://www.amazon.com/Tuff-Stuff-Tire-Deflator/dp/B0049WPUX2/?tag=959media-20 They were hard to adjust as the reviews said. What was not said was how slow they are! Takes almost 10 minutes to go down to my desired 10 psi. I can pull the stem and...