Has anyone done surfactant analysis using HPLC -RI

I want to analyze non-ionic surfactant (fatty alcohol ethoxylate and tallowamine ethoxylate ) in a formulation. I tried C18 column with 80:20  Methanol: water combination but I am not getting proper peaks. Due to branched alchol I am getting humps in the chromatogram. Can anyone suggest how to go forward with RI detector as we do not have ELSD detector.

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