Yess! I got carronades for my ship.
Guess where I got it - in Bordeaux (economy 865/ industry 1000)
I come to Bordeaux, went to shipyard , invested 50000, and at REMODEL menu i checked figureheads - nothing special, but when i requested a GUNS shipbuilder says "we have something special". And I replaced my 150 canons for 150 carronades

. But there was no Godess figures proposal

. I tried to enter and exit REMODEL menu. and even Enter and exit shipyard - no more proposals.
How often this special proposal occur? 1 time per city or 1 time per day? does getting carronades eliminate the chance of getting Godess figures forever?
I have 7 defenseless LaReales and 1 Full-Rigged ship (101 durability, crew -220, guns 150 carronades, shots 150, food 300,water 300) and first mate with gunnery skill
I Know that to win a battle you need crew allocated to combat equal the number of cannons , quantity of shots equal the number of cannons, you need to sink pirate's flagship.
Is this one ship is enough to defeat Idin Leis?