Those slightly older cells of yours are still in pristine shape. Maybe that's partly due to your use of a hobby charger and the parameters you've set which result in a ~ 4.14 termination voltage. Or maybe they just haven't been used all that much. Or perhaps they are in good shape because they were good cells to begin with and/or all of the above.
As I said earlier, I'm not that keen on consumer style cradle chargers which attempt to stuff every last milliamp-hour of capacity back into a li-ion cell. The first objection I have you picked up on, in that bringing a cell to full charge every cycle is thought to reduce cycle life.
The other reason I don't care for such chargers is they spend far too much time shoving those last few milliamp-hours of capacity back into a cell. In the case of HKJ's 1x18650 charging chart, 4.15V is achieved somewhere around the 4 hour mark. There is very little capacity gain from that point to 4.2V as you can see in the far right hand scale of the chart - inconsequential capacity is forgone if the cell terminates early. Bringing the cell all the way to 4.2V takes another 2 hours.
Two hours for very little gain - honestly I can't see any reason to push the cell there except for bragging rights.
More importantly, the longer the charge process takes, the less likely it is to be supervised properly. This becomes an even more serious problem when the device is fully stuffed with cells and requires 11 hours plus before the done light comes on.
So there's three reasons why I'm personally not in favour of adding 50% more charge time: very little capacity gain to show for significantly extended charge time; reduced cell life span; and, more chance the charge process will go unsupervised.