To bring closure to this thread, I have solved this issue for at least my printer. I tried several different software fixes such as PWM vs. Bang-Bang control of heat bed etc, and none were helpful for me. The issue as @Torgeir has pointed out is that there is a significant voltage drop.   In the (poor) screenshot of the oscilloscope you can see the drop in the 24V line when the heat bed turns ON/OFF. The drop is around 400mV.      With more time (and will) I wanted
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