I might be blind but do you have IAT log?
15psi is probably on the limit of a circuit car too, would be interesting to see.
Do you have any adjustment with the waterpump PID? I think MHD has finally made this available, I'm not sure if XDFs have though. Might help with oil temps a little bit (not really sure about 35i non is/1M setup).
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Bilstein CS | Rays ZE40 | Solid/spherical front / rear.
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