[Nexus 5 General] anactoraaron:
Having values of 1 for 18 and on won't actually make all blacks the same color from what I've found. My newest profile with all 1's for value 18 shows up in HCFR as R = .83, G = .84, B = 1.67. Value 20 with all 1's shows up in HCFR as B=.49, G=.503 B=1.26. There is a difference in all my values in HCFR from 18-24 even though they are all at 1 in my newest profile (I'll upload it later). I'm guessing this could be some kind of manufacturing tolerance as not all displays will have the same black levels.

Having done this a few times now, when starting from scratch (especially if it's your first time) it's best to adjust ALL 12 BEGINNING values for green and blue to the same amounts as they are for Value #1-calibrated at the start before moving on to value #2, as every value 1-12 seems tied together in some way (for some reason adjusting value #3 also affected values 1 & 2). So what I did this time is when a future value was no longer greater than the one that I was calibrating (the values should increase as you go as this makes those values darker - which is what you're supposed to be after), I would adjust ahead and raise those future values 1-2 higher than the value I was currently on, and many times this also helped me to be more precise with my current value. For example (not using the actual values here, but this is representative of what I experienced), my value #5 according to the calibration spreadsheet needed to be R=406.4 G=406.6 B=407.2 and I was at R=406.7 G=405.3 B=406.8. Adjusting value #5 for green -1 (to make it higher in Faux Display) caused me to get R=406.6 G=407.9 B=407.3 (which would only leave me with a choice of 405 or 408), but if I adjusted the entire curve from 6 to 12 -1 to -2 I would get very darn close getting something like R=406.5 G=406.8 B=407.1. This would be useful to know if it's your first time doing this, and after a few times calibrating you sort of get a '6th sense' on how much you need to adjust those future values (if you are going in order 1-12, which is the recommended way). I haven't seen any correlation with values 13-24 and adjusting those in advance doesn't do anything to get you closer to where you need to be (ie: adjusting values 14-24 doesn't do anything to your results for value 13, but my above example is correct - adjusting 6-12 will affect value 5).

This helps out a great deal as it's frustrating to get the first value good (like R=433.1 G=433.3 B=433.6) to then get values 2-5 good to then go back to value #1 and then see R=429.6 G=433.8 B=440.1 (this happened to me the first go around, which then prompted me to go back and start over multiple times - hence my saying it was a 'three day journey' in my first post in this thread).

I'm charging my phone ATM and I will post my new profile which is much more accurate and consistent for me anyways, especially values 1-12 - they are all almost equal and aligned with the calibration spreadsheet (with the exception of values 18 and on, they are a bit higher than the calibration sheet but I'm at 1's so unless I adjust the neg values - which I don't want to do - I can't get closer).

EDIT: Added new profile. White Point 31, 6500k gamma 2.2 - as perfect as I can get with wp31.