Different base nute's is not the fix here, though switching should be OK,... Foliar treatment with a micronute supp' is the fastest and best way to deal with it, help hold things over while you rework the nutes and double check pH to make sure it's not overly acidic (locks out S) or too alkaline (locks out Fe, Zn, et.al)....
....yeah, this girl has been troublesome all along,.. it happens, mate, I've had plants that grew OK but seemed to have some sort of uptake problem with micro's in particular,... It took some serious blasting with Optic Foliar Transport and EJM to load up enough to quell the symptoms,... Transport is a sort of special carrier solution that allows temporary penetration through the leaf surface (cuticle layer) allowing nutes to sink right in vs. trickling in via the stomata by the usual foliar spray methods....