What are your AFR's telling you? Was there a big difference there? If they're still in the same range, then the ECU is compensating correctly, and you have the fuel for it. But if they're off, you should get a retune. 2.5psi is a pretty significant change.
I only have the tuner version, not the shop version of UpRev, and I have a G37. I'm not sure how the software differs, but I haven't seen an elevation compensation table.
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