If this was all on the same dyno, it should be noted that dyno shops OFTEN have meters that are old, dirty and/or downright inaccurate. We've had that problem out here with one shop SCC used to use for magazine cars. Given that there are many thousands of dynos provided for JWT chips and this isn't exhibited, four completely different cars showing this same pattern sure is strange, but I'd look at other factors first if possible.
Were they done at the same shop by chance?
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