Probably the cheapest and best option is to build more wind and not care too much if it increases curtailment.
Yes, all the things mentioned should be looked into and done when it makes financial sense but "wasting wind" is much less a thing to worry about than "burning gas", and I'd rather waste wind than waste money.
Depends on what you mean by overproducing. The energy put into an electrical grid must be balanced by demand or bad things will happen. I think the second answer in the below StackExchange is a good description.
https://electronics.stackexchange.com/questions/117437/what-...