ICP-MS 7700 Tune not passing in Helium gas mode (%RSD is little bit high)

I am running ICP-MS 7700 with mass hunter, for tune with Helium gas mode ON, my %RSD is little bit high. can anybody help me to make it pass? what will be the troubleshoots? I cleaned cones, changed tubings for perilistic pumps still no improvement.

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