What fin size for Evo IQ 71 2011 and North Ice 5.3 sail?

[van]

Hi guys,

Last year I bought an Evo 71 based on your advise. I'm 70 kg and an experienced rider. Based on my weight I seem to remember that you had told me that I can take it out on a 5.3 even thought you recommend the board up to 5.0 max. What I failed to ask at the time is - using it with a single fin what fin size would you recommend I use on it for a 5.3 and a 5.0 sail. I would guess the Maui Ultra X-wave 22 cm fin I use would be small for this size of sail. I have only used the board on a 4.7 and 4.2 till now with the Maui 22cm fin. Many thanks in advance. Awaiting your response.

Regards
Van