K40 output power

The other day I tried to engrave a grey scale image. I set the max and min. power, but the min power set at 1.5% was still to high, it ws burning deep on wood. I adjusted speed to 6000mm/m and on min it was still black and burning deep.
Is there a work around to calibrate power outage so that 1.0 or 1.5 is not as high?

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