[Ether]

Some random thoughts:

I was wondering if you or anyone on your team calculated how much capacitance would be needed to actually make a difference.

You should focus on understanding why the brownouts are occurring, and address the root cause rather than treating the symptoms.

If you were to provide sufficient detail about your design, I think there are people here on CD who could make some very constructive suggestions for simple changes you could make that would possibly eliminate the brownouts entirely.

Follow Mike's advice about your wiring, even though you think it is "100% correct and pristine".