FX Impact/Crown reg question

As I've said before, Huma has made three versions of the Gen 3 reg for the Impact/Crown.
1) Low pressure, 10 washers )()()()()( single stack using 0.5mm washers for 60-135 bar
2) High pressure, 12 washers ))(())(())(( double stack using 0.4mm washers for ?? presumably something like 80-150 bar
3) Extra high pressure 8 washers )()()()( single stack of 0.6mm washers for 100-200 bar

Huma says they discontinued the HP reg stack as it overlaps the other two and they recommend single stacks work better????

My question is, is it more responsive/better to use heavier washers as in the EHP, or the lighter washers in the LP if you want to use the reg in the 100-135 bar range?