Do I need a new board for pow?

I have been snowboarding for 3 seasons.
Age: 23
Height and Weight: 6'4", 240LBs (working on losing weight, hopefully down to 230 by snowboarding season).
Boot Size: 11
Budget: Lower the better but will invest money if it will make experience better.
Type of riding: Love Speed (gone over 50 mph down east at MT High) and currently working on jumps.

I have only snowboarded at MT High and Bear Mountain in CA. That is what I am used to. I am planning on making some trips this season to bigger better mountains in north Cal, Colorado, Oregon...

My current setup in a 163W Morrow Fury board with Large Lamar Bindings. Most sizing charts would say I need a longer board. Maybe a 169W. The thing is that riding those places, MT High/Bear, actually made me think of getting a shorter board. Easier to turn, take jumps and lighter.

The question is whether a shorter board, 156-159, would be too short even for those mountains and is my Morrow too short for heading up to the bigger mountains considering my size.

:dizzy:
Should I get a shorter board for use on park and use my Morrow for when I head up to pow mountains?
--OR-- :dunno:
Should I stick with my currently board for hard packed groomed mountains and get a longer board for pow?
--OR-- :dunno:
Do I need two new board, shorter for MT High/Bear and longer one for the other mountains?

Any advice helps, thanx!!!