Another option for the N2O timing concerns is to wire a resistor in place of the stock one. You can use the very low temperature area of the Spark IAT table {B5911} to retard the timing as you deem necessary. Make sure you update the tables {B5943} & {B5944} to "1" for all values at the minimum. I made a quick schematic for an earlier PCM but I'm sure you can use this jpg to get an idea of what to do electrically.
Al
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