I might try this, doing the initial pulls with EA instead of acetone and using limonene for the latter cleanup as I do not want to boil xylene. Why did you decide to use benzoic acid? Do you not suppose fumaric or citric could still form crystals?

Also, when initially salting the EA, did you add a fumaric/citric saturated EA solution or did you just directly add the fumaric/citric granules