Also, I think we should stop using "food" and "wool" as a euphamism for "nothing". If a province produced nothing of any value, give it NONE!
Right now food and wool are never profitable, which is crazy since the wool trade was the bread and butter of the economy of Castille.
Grain should ONLY be in provinces where it is a total breadbasket and exported food on a massive scale, such as Ukraine, Argentina, interior California and other centers of food production. Domestic use doesn't count, these are EXPORT goods.
We need to cut down the number of wool, fish and grain provinces by about half.
I propose the following: we have a rarely-used ivory good, yet it now also represents Whaling. Give whaling provinces Whaling. For a province to produce Fish it has to be like Iceland or Newfoundland and produce TONS of fish for EXPORT! If it doesn't, but that's the only thing it does produce, then give the province None good. (We'll give NONE some crap value like 4 or something, to represent trinkets and carpets and crap).
Same with Grain, a: find another export, ANY other export, b: if they don't make anything other than food for domestic consumption, then NONE.
For wool, if they aren't famous for producing wool (like Castille) then don't give them wool. Wool does not equate to nomadic herdsmen, and the places where it has been set to represent this, should be set to NONE instead.