Skimmed your post, but yes.
I have a 156w that is good in pow and fun all around board on any day. I bought a 159w last season that is awesome in pow and so much better for bigger mountain stuff - deep powder, steeps, cliffs, chutes etc. The 156w will do for light powder days, side hits, some jumps, small cliffs, semi-park stuff and such.
But both are such different boards though, 156w is full reverse camber, 159w is rocker in the front and small camber under the back foot.