High Background Noise

I am new on HPLC. Our lab has a 1200 Agilent series with FID detector. I am trying to run aflatoxin on C18-phyenyl column with mobile phase H20/MeOH/ACN (50/40/10). The background noise is terrible. I have tried changing the methanol, column. What else can I do? Can it be the FLD detector?

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