I don’t know how you come from increased rating drift to stability.
We are probably in this scenario:
since data from old OGS suggests most players chose the lowest rank
while the average rating of new accounts seems to be closer to the 1500 mark
If we just adjust the rating->rank formula to account for the drift, inactive accounts will increase in rank over time. In this case my question would be: for how long do I’ve to stop playing go to become 9d.