Not sure exactly what could be causing it, but i remember reading in some other threads where someone was in the exact same situation as you - saw timing issues in non-ACN map due to crappy west coast 91 gas, switched to ACN map and started getting boost spikes/overboost that were not present in non ACN map.
Sorry i can't help, but i'm pretty sure you are not the only one. I did not see a resolution on there, might want to send your logs for review and ask the question.
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