We do understand what is this all about, but i really do not care about 12 pd penetration..just not firing them at great distance. And maybe you overestimate your interpretation abilities, telling us we don`t understand what is this all about.
Since thickness upgrades were downgraded, me personally is fine with thickness/hp as it is, and i personally don`t give a shit about 18 pds not being able to penetrate a 1st rate at close range, or doing not so much damage, as some people would like to. Call her Ocean, Santi or Vic.
It comes with the boat you are in, and you should remember that all 1st, 2nd and 3rd rates have 42,32 and 24 pds on their decks, which are actually doing the most damage to those big boats, so if you use a smaller boat, and your cannons don`t penetrate the Ocean "because of the shape of her hull", then sail a bigger one.
So, you may connect or separate a threadmakers engagement in a Trincomalee vs Ocean, that is up to you, fact is that SMALLER SHIPS with SMALLER GUNS, or SMALLER GUNS on a BIGGER SHIP can NOT do much damage to a ship, which has 12 % thickness upgrade, plus basic thickness value depending on her woods she`s been made of.
Otherwise stop messing around with BR, HP, Thickness and all that, because too many are tired of this BS, too many people want a game that is working, and its worth playing.
If you want a solution, a fair and sustainable one, there are only 2 possibilities, and both of them you probably won`t like:
1. Remove all heavy woods from game, only OAK remains as THE shipbuilding wood, as it was historically, considering 95% of all ships built in "our" era.
2. Remove ALL thickness upgrades.
What would you like to have? Plague or Cholera?