JuMP 0.18 + CPLEX: How to force user cuts?

I suggest manually modifying the source until you get something that works.

Note that CPX_USECUT_FORCE will only guarantee that if a cut is added, it will not be purged later on in the solve. It doesn’t guarantee that the callback will be called in the first place.

I don’t think you can control when and how many times CPLEX decides to call your callback.