Hurricane burners were not designed to give tall flames, it is a common misconception. The person at Hurricane I talked with told me he gets calls all the time from people complaining that the flames are not high enough. Mine are less than two inches high and mostly blue with some yellow tips, and they will boil 14 gallons of wort a bit too much.
Do a pressure test first http://www.komar.org/faq/manometer/
to figure out where you need to be. 1/8" is too big for my set up.