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"Partial refresh" is correct in the sense that it only changes what is different.
It's easy to slam pixels to black or white. Gray requires more nuance.
The waveforms sent to the eink have to be adjusted for the temperature of the panel.
The accuracy of the temperature sensor, the number of waveforms and the Vcom of the panel all play a role in accuracy.
It's like if somebody told you to turn (without looking), a volume control to 66%, then 25%, then 87%, then 50%.
You could do this more easily if you were allowed to turn it fully counterclockwise during each setting.
Keep your flashing. I find no-flash acceptable.
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