Best fin for kode 112 and ncx 8.0

[MOP]

From the given sail range a kode 112 and ncx 8.0 should work fine.

I have sailed the ncx 8.0 on bigger boards but now I have bought a kode 112.

Weight 90 kg.

What is the best fin for this combination?

Mostly choppy waters

Thanks

[MOP]

38? 40? 42?