Adjusting for power fall-off

I’ve got a large engraving, 18" square B/W bitmap with 2" border around it with various cuts.
My machine is 35x50" and I get power fall-off where the max power in the bottom right is about 5% lower than top left - enough to cause different burn color.

The image is 1-bit color (black or white, no gray)

Is there a good way to compensate for this power fall-off?

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