ISSA - International Slalom Skateboarding Association

I have the above deck and was wondering if there is anyway I can tell if the flex is soft, med, or med stiff by looking or measuring the deck thickness?
I am new to cyberslalom and have been riding old stiff maple boards from USA so this is a great change for me.
Today, 1st timeout on the deck I managed a 10.6 sec pass, though the flex feels strange to me and my starts were woeful. I am about 175lbs, previous PB was 11.1.
Any ideas would be appreciated as I cannot find any marking on the board to indicate stiffness.

I just happen to have a LIGHT, MEDIUM and STIFF PS Unlimited.

Light - 5 plies (Dark, light, dark, light, dark)
Medium - 6 plies (Dark, light, dark, light, dark, light.)
Stiff - 7 plies. (Dark, light, dark, light, dark, light, dark)

Thanks Wesley,
I have 6 ply wood + one carbon fibre and one triaxial fibreglass .
Is that a medium by your account?

Robert STIRLING wrote:Thanks Wesley,
I have 6 ply wood + one carbon fibre and one triaxial fibreglass .
Is that a medium by your account?

I would assume so. I think all the materials are the same and then each board is cut with a different template.