You probably just need to get it dialed in. The 30 lb injectors are pretty big for the power it's making right now (N/A) so I think a custom burnt chip with info from a dyno run would be best. One with a switch option would be necessary for the nitrous though.
It might be something like valve float that's costing a bunch of hp at the top end or something like that, you'll need to dyno it to truly know.
What are your fuel pressure and base timing at right now?
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393W: AFR 205's, hydraulic roller, TKO600.
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