If i have a 159 now would it be a big difference if i went down to a 156 and im still growing what should i do?

Tech Specs:

Lengths:

(Narrow) 148cm, (Narrow) 151cm, 152cm, 156cm, (Wide) 156cm, 159cm, )Wide) 159cm 

Shape:

Reverse-camber twin 

Effective edge:

[156cm] 1170mm 

Waist width:

[Narrow 148cm] 242mm, [156cm] 255mm, [Wide 156cm] 265mm 

Sidecut radius:

[156cm] 8.3m 

Stance width:

[Narrow 148cm] 18.5-24in [156cm] 20.25-26in, [Wide 156cm] 20.25-26in 

Stance setback:

Centered 

Core material:

H-Pop (wood alloy) 

Base:

Sintered UHMW 

Recommended Use:

Freestyle, jibbing, pipe, powder 

Manufacturer Warranty:

1 Year