That will need to be sorted out! A 6th rate frigate should not be a lesser ship than a sloop of war. The two were designed by different modders who presumably had their own ideas of their ships' stats without comparing to other types already in use, such as the "Postillionen" 6th rate frigates. Those at least carry 12lb cannons - long guns, not carronades. I'll maybe change the "Greyhound" frigates to carry the same. (Technically incorrect; as far as I can tell, the real HMS Greyhound from 1720 only had 6lb guns, but although the model may be based on that ship, it's used as a generic 6th rate frigate throughout the game. The "Castell Friedrichsburg" brigantines are also much better armed than their real-world counterpart, which was a merchant with hardly any guns at all.)