I'm kind of confused on your question.
You didn't like your berzerker? You didn't like your charlie either?
The Berzerker was pretty much made for riding interior BC terrain. Deep powder, Cliffs, Chutes, Trees and natural jumps.
The Charlie should tear apart any powder you ride.
What exactly is your question?
Sorry, exact question from all that is "does the flex of a board make that big of difference?"