Can you share the XDF you have? Some tables in there I don't have defined.Currently trying to fix my rail pressure oscillation with my helix x3. I've raised the targets in ip_fup_sp_hom to reasonable values (converted to psi) that should easily be achievable via the helix. With these setpoints, I still get peaks of 2250-2400 psi and valley of 1350 psi, averaging 1650 psi.
Any other maps you got in mind?
I'm thinking external fpr next with a set low pressure of 80+ psi to feed the helix enough fuel.