K86 - Fin

[ClausKrike]

Hi guys.

I am the happy owner of a Kode86 from 2010 in wood carbon, which primarily is used with a no-cam sail in size 5.2 and sometimes with 4.5.
My question is which option is best if the fin must be changed from Drake Natural Wave 250 to something else and size ?
The reason is that I am experiencing problem with going up wind in freeride conditions with a lot of chop.
I weigh 80 kg and is in the advanced end of the scale.

Best Regards
CK