I dive a din configuration on my 133 steel tanks. My understanding is you need Din first stage for HP 3442 Steel tanks. My Dive Buddy is coming over to HP Steel from aluminum 100s... The Ole Timers here told him just to run a yoke... What is the real deal???? Do you really need din for HP Steel Tanks??
Another vote for DIN. Running those kind of fill pressures (3600+) you really cannot trust the non-captured o-ring design of a yoke regulator.