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User suggests a method to improve calibration accuracy: use several different known-draw loads to calculate individual multipliers for each load, then average these to get a more precise overall multiplier for the CT sensor and sampler chip.
If you used several different known-draw loads, you could use "the maths" approach (shown a couple of times in other comments) to calculate the multiplier for each load, then average them to get even closer to the true multiplier for that CT+sampler chip.