I read your message multiple times, but sorry but I still have not understood the explanation
The bottom balancing you talk about implies that you discharge all cells at bottom floor voltage before charging. It seems it's the opposite of the good utilization of lithium cell, IE charge them as soon as you can, even if they are not empty. Discharge them to the bottom floor voltage before charging becomes a waste of energy.
And I don't understand why this bottom balancing will change something on the end of charge. If cells don't have exactly the same capacity, cells with the lowest capacity will reach the max voltage threshold before cells with the highest capacity. It will be mandatory to still cut the charging to not overcharge them. And the result is a pack with a total voltage lower than it should if cells with highest capacity have not been discharged to the bottom balancing voltage before charging !??