Ok since you bumped it and i'm bored i'll give some feedback. Firstly I think for 50% East Coast that is a big big ski but that said you didn't post how big you were.
That said I had a look at the design and have the following points.
-118 is a lot underfoot. You can ski powder plenty well on 105-110 and yes a centimeter makes a fairly big difference in terms of edge to edge performance.
- 146 is really big in the tips but that could work in your favor since you want to be able to ski groomers. A big difference between tip and midsole gives you lots of sidecut.
- Symmetric flex on a ski that is fairly far from symmetrical in terms of shape?
- No early taper?
- Basically for 50/50 I think you have a ski that is too extreme.
All that said i'll make a suggestion based on my experiences of EP Pro, Hellbent, Elizabeths, Obsethed, Reno Rocker. Some camber underfoot is ok 4mm sounds good. Rocker should probably be symmetrical since you are making a jibby ski. Early taper gives you the chance to have sidecut for those groomers but still not drag too much.
I would look more at something like:
Tip/Mid/Tail: 137-110-135 with Early taper giving you a short radius
Radius: In the ballpark of 16-20m
Flex: More pow performance: Mid-Stiff underfoot, Mid-Soft in the tip/tail
More groomer performance: Stiff underfoot - Mid in the tip/tail
But no ski can do it all perfectly and no rockered ski will ever rail on ice.
Hope that helped.