I think what you are really thinking of is How to correlate 95%/98% proctor compaction to N value, or results of plate load test or CPT. It would answer your question about how little more 98% can carry than 95% and how much can 95% carry.
There may well be such correlations somewhere which I...
The distribution of pressure in the soil induced by preload or any load on the soil follows a pattern of bulbs of pressures. It diminishes as it goes deeper and eventually it becomes zero.
Settlement calculations would normally not be calculated for the entire layer of the soil down to the zero...
