Don't forget - going back to Keith's first suggestion - that root issues can lead to nutrient uptake issues, that in-turn can lead to nutrient deficiencies.
If you changed the medium, the current roots might not be functioning as well as they should be.
"Harley" is right that little discussion is given to "overdosing" of nutrients (I do address that in my talk on nutrients), but I think that a reasonable use of most commercial fertilizers is not likely to lead one down that path. (Folks that overdo trace elements, on the other had, often get out of control.)
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