Second stage feed pressure ...

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Second stage feed pressure increase tells me there maybe a issue with scaling (chemical fouling) in the membranes (besides organic/colloidal fouling in first stage), so check your anti-scalant and/or acid dosing rates & concentrations. Also try to lower the conversion to see if any difference. You report DP is not increasing but how do you measure it? Do NOT take the difference between feed pressure and reject pressure - need to measure the pressure differential across the membranes ON LY (no piping/valve, etc. pressure drops). Finally I suggest you remove one membrane from first stage and one from second stage and do an autopsy to see what you got!