Because you are relying on methanol for octane you're using the progressive meth map, boost is mapped on meth flow, and during a NLS the JB4 cuts meth flow momentarily so you don't grenade your intake manifold. So this is all normal behavior for the situation.
I don't see any benefit/need for custom tuning on this application. If you want to run it more aggressively you can do that. But on 90 octane I don't think I would. I would update to the latest v32.6 firmware though as we made some methanol mapping changes that may benefit you.
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