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You have some room to lean it out some... 11.7-11.8 WOT AFR On the nitrous is still a safe bet (especially anything under 150 shot) . 12.0 is still within safety but wouldn't want to see anything above 12.3,12.5 for example.
You will probably gain 8-10 hp cleaning up the afr from where it's at now. If you don't have a bottle warmer get one! Ideal 900-950 psi makes a huge difference and can be another 5,10,15hp.
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