I think that idea is somewhat flawed. I think that Roundships should have High defense stats and mdeium attack and that Galley-types should have high attack and low defense. I'm too slack to explain now.

GALLIA SOTIL (Ordinary Galley)
Spanish
The most powerful of the 'ordinary galleys' in front on combat due to the large number of soldiers carried. They are rowed alla scaloccio (generally four men to an oar, 3 slaves and 1 freeman), and are the slowest of their type.
Over long distance, under sail, they are to slowest of the gallia sottil.

Venetian
The Venetian galleys were rowed alla sensile (that is one man to an oar (gruoped in three banks), all free oarsmen) and were on the short hual the fastest as a result, it is not unreasonable to expect them to make 7 knots for about two miles. They have a resonable amount of combat power owning to their generally superior gun armament. Under sail the are the second fastest of the gallia sottil.

Ottoman & North African
The Musilm galleys are the hardest to place becuase in formal head on fleet engagement they were at a severe disadvatage to the heavier built Christian galleys, but once the battle degenerated a general melee their great mavorability, in comparison to even the Venetians, ment they could cut off and capture their opponents with ease. They are the fastest gallia sotti under sail. For the most part they were rowed alla scaloccio.

GALIOT
North African
North African galoits tended to be the best armed. In fact they were often confused galleys over long distances. They were usually rowed by free oarsmen who could swing a sword or shoot a bow in a boarding action or coastal raid. Most had between sixty and eighty oarsmen along with around fifty soldiers.

Ottoman/Venetian/Spainsh
No idea. Will read a bit more on it tonight.

Will write more later.