Imho that depends on what you are wanting in this ski, your size and how fast you ski. I have ProTest for deep days so this is my up to 8” of new and chopped up pow mobbing ski so I’m going 4/5.
I always felt my Hybrid Lhasa could be a little stiffer. When really mashing the gas pedal I could feel the tip fold some on cut up snow so the stiffer flex should alleviate that completely.