Will mag swap fix dark/loud P90 neck pickup?

A3 will make the neck pickup both brighter and quieter, but it won't be by a large amount compared to the A2. You could swap the bridge for A6 which isn't much brighter than A2 but it's more powerful.

I would definitely try this: A3 in the neck and lower the pickup and A6 in the bridge. It should get you in the ballpark.
 
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