I am facing a conundrum. You see, my world has magic, but this magic is very restricted and has great limitations. As consequence of these limitations, they never got into metalwork, developing no cannons, but their magically enhanced woodwork allowed for far better wood than anything medieval. Soldiers operating the wooden siege weapons also have ability to give their siege weapon a small boost during firing, although it isn't too large.
My question is, how much would I really have to up the specs of balistae/catapults to make them viable weapons for ship of the line tactics?
Specifications:
Medieval level civilizations did discover such thing as medieval incendiary weapons. Greek flame, white phosphorus, etc. are in regular use. They do have gunpowder, but wooden cannons are not very useful, since their effect can't be magically enhanced, and are mostly seen as nobility entertainment with little military value, much less naval aplication.
There are no magic explosives. At least not in the hands of pre-magic-industrial societies.
Archery is stronger (and logically, also has higher range), because of soldiers being able to magically increase their physical strength, as well as better materials for bows and arrows and more skilled woodwork.
Combat mages are restricted to throwing flame at enemies and don't really have any attack with range over 100 m, or 150 m with help of disposable magic tools.
I mean having bolt and stone throwing ships of line is a really cool image, but I need to make sure whether it would be practical in my world, or whether it would require too much magic for it to be viable in my setting.