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Based on your post the tune is trying to stop boost at 14 psi which is good. When it is colder you should be making more power easily so then the next thing would be to check the reliability of the wastegate. I'm not too familiar with any frs/ brz kits but the concepts for fi should be the same. What is your spring set to handle? What size is the wastegate? It should be sized properly but it's good to start with those questions.
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