How far back from "true center" is the recommended mounting point on these? I have last year's Jibs, and they're pretty close to center, less than 2cm back

Tech Specs:

Lengths:

178cm, 188cm 

Dimensions:

[178cm] 132 / 100 / 123mm; [188cm] 144 / 100 / 128cm 

Turn Radius:

[178cm] 18m; [188cm] 19m 

Construction:

Traditional sandwich 

Core Material:

Wood 

Base:

Sintered UMHW 

Tail:

Twintip 

Binding System:

No 

Binding Included:

No 

Recommended Use:

All-mountain freestyle 

Manufacturer Warranty:

1 Year