How do I improve the peak shape and resolution in this region of the chromatogram?

Analytes are volatiles in the headspace of rice. Column is DB-Wax-- a column reported to be successful in separating rice VOCs. In this region, temperature in the programming is already held constant. Increasing the split ratio only decreases the signal and does not separate the peaks from one another (shown in the diagram as superimposed chromatograms).

Thanks!

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