@CatherineEng1 - You’re right about the finer gradation in the color map than in grayscale - That’s one of the reasons Depthkit uses hue-encoded depth. What is the bit depth of the grayscale output you are using?
I just posted an update in this thread including the contents of a 5x5x5 LUT which should be helpful in transforming the hue-encoded depth map into a grayscale one while leaving the RGB portion of the combined-per-pixel relatively unchanged. Hope this helps!