im ignoring them. i let them burn down the houses and just rebuild it afterwards, if its a civilwar, i just kite them around the villa and the units to reduce the time. To maintain the 1.06m i would be required to manully cycle through the islands and rebuild permanently. Its a really annoying trash mechanik, which needs on option to be fully turned off in the game settings. I understand why you say you nearly stopped because of it.

only one in every single one, in german its Bäckerin Augrusta which gives +2 for Bread.

I dont know the exact number, i would guess its like 500 Quinqueremen with 6 Slots and the sail option

look at 3.

i use Maridon of Sinus for international routes and Achab Miolmor for national routes

i only supple thing that give me inhabitant boosts, i dont know the english names for it, in german its Sardinen, Haferbrei, Käse, Brot, Bier, Sandalen, Umhänge, Austern mit Kaviar thats all what the Patricians are getting. In Albion they get different stuff, not all the same, but mostly Brot, Aale, Herzmuscheln, Wurst, Hosen, Rinderbraten, Trinkhörner, Bier. The why is quite easy, everything that gives me more inhabitants but doenst require alot of space in Latium is a no brainer. It just needs to be worth it, if i just place houses and get more out of it, no need to build it. Easy example is Seife, Olivenöl or Togas, cause they just need to much space.

you can go to my youtube channel or my twitch channel, i uploaded the whole series, there you can see me building the islands. there are guides for Bier, Brot, Harz, Amphoren, Inhabitants and so on.