Should I get a 151 or a 154?

I purchased a 151 in the Flying V but now wonder if I should have grabbed the 154. Im almost 5'8 and weigh 150lbs. I have ridden a 154 custom (camber) for the past 4 years and sized down due to the fact that it has the Flying V hybrid tech.
I ride East Coast mainly (Vt, and groomers) but travel out west a handful of times through the year. Just wondering if its going to be too short for the powder days. Thoughts?

Tech Specs:

Length:

148 cm, 151 cm, 154 cm, 156 cm, 158 cm, 160 cm, 163 cm 

Shape:

directional twin 

Flex:

medium (5 of 10 on Burton's scale) 

Camber:

Flying V (hybrid) 

Sidewalls:

10:45 

Effective Edge:

[148cm] 1123 mm; [151cm] 1153 mm; [154cm] 1183 mm; [156cm] 1203 mm; [158cm] 1223 mm; [160cm] 1243 mm; [163cm] 1268 mm 

Waist Width:

[148cm] 245 mm; [151cm] 248 mm; [154cm] 252 mm; [156cm] 253 mm; [158cm] 254 mm; [160cm] 255 mm; [163cm] 257 mm 

Sidecut Radius:

[148cm] 7.3 m; [151cm] 7.5 m; [154cm] 7.7 m; [156cm] 7.9 m; [158cm 8.0 m; [160cm] 8.1 m; [163cm] 8.3 m 

Stance Width:

[148cm] 20 in; [151, 154, 156cm} 21 in; [158, 160, 163cm] 22 in 

Stance Setback:

0.4 in 

Core:

Super Fly II (wood), triax glass 

Base:

sintered 

Recommended Use:

all-mountain 

Manufacturer Warranty:

1 year