Welcome to the forum Metal Smith!
Who, besides you recommends lighting oxygen and fuel (propylene) together?
I'd like to know myself as I've never been instructed in the lighting sequence you mention.
There are several different kinds of fuel gas hoses... Some can carry Acetylene and the alternative gasses.. Some cannot.
Your hose should be marked. You need to check those markings and make your decision based on the standard.
See this
http://www.crosshose.com/Tech_Bulletin_Welding_Hose-What_hose_is_needed_42904.pdfEdit: The potential problem I see in lighting fuel and gas together is that it would be very difficult for the operator to sense the a correct proportion of each gas before the torch is lighted.
Edit edit: I stand corrected (learn something every day)]
Jody Collier from Welding Tips and Tricks (Welding instructor for Delta Airlines) is somebody I hold in highest regard and explains about lighting propylene oxy-fuel torches and provides good instruction.
http://www.weldingtipsandtricks.com/oxy-fuel-cutting.html'