Not exactly the same thing Kenny..... That is a discharge curve you need to analyze a charge curve. It has been a while since I looked at this but to my recollection when charging you charge at CC until that voltage is reached and then CV or hold the voltage till some current cutoff. It's really the CV mode that one can avoid and voltage is not really an issue. You can calculate the energy under the curve and see that it's maybe 5% of the total you put in the cell. I charged mine to 3.65V and then cutoff the charger skipping the CV mode altogether. There are several papers out where they experimented with different voltages .... i might still have them if you want to read them. Also, in my own experiments that during the CV mode the temperature in the cell rises dramatically in a short period. If memory serves it was a 50% temp rise in 5 minutes up to 50 C or something before I shut it down.+1 on what paul said.
if you ever over-discharged the cells (took them too low), then the damage was done. Some may take longer to manifest than others, but they have been bit and will die.
From what i have seen and read about that chemistry i wouldn't want to charge above 3.34 nor discharge below 3.0--there is no real energy available outside that band, and the risk of damage is too high.
just my 2¢, ymmv