After analyzing your gameplay, I was once again convinced that it's better to upgrade Spinners into Weavers in one city than to build additional Spinners in another city. Upgrading costs 10 crystals and 5000 gold less than building new ones, and the result is the same; the increase is +2, but the upgraded units are stronger.
By the way, a question for discussion: is it worth upgrading recruitment buildings in all cities? If you only upgrade in one, it will save significant resources, and you can recruit all troops as upgraded units if you recruit them in the city with the upgrade. On the other hand, there will be less growth, especially for core units.
Цикл "Закадычные враги": "Особенное гостеприимство, "Супероружие", "Меж молотом и наковальней"
"Падение Шантири"
Кампания для "Кодекса Войны"
"Выбор Сагиттеля"