That's a variation on what I've tried in the past; I adjust the 5% greyscale slot down to 1% (maybe 0.5% I can't remember at the moment) and increase the 'luma' setting by 0.1 or 0.2 which makes the 17 bar more visible, but without raising the absolute black level.
Maybe we're both saying the same thing, but I leave the 0% slot at 0, so I think we might differ slightly (whether it makes any difference which method used is another matter).
My biggest issue is improving my room and/or changing to a different screen otherwise there is little point in upgrading to the newer models anyway...
"Don't believe everything you read on the internet". William Shakespeare 1615