would highly recommend you the KODE 92. I will work great with 5,7 and 5,0. You can go with single fin or twin fin setup. The board has a good length and will start planing quick.
The KODE is an extremely easy going shape and the board feels fast on the water, what gives you enough drive for the Croatian wave conditions in Povlja.
The EVO IQ 86 is probably a bit close to the EVO 80, what's a great board indeed. You can keep it for strong wind days and use it with your 4.3m and 5.0. I personally sailed most 4,5 and 5,0 on the EVO 80.
Hope it helps and go for the KODE 92,
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