I think your LifePo4 graph is wrong and mixed it up with Li Ion. No graph on the net is this high of voltage as you show the curve to 4.2 volts and low to 2.5. Most LifePo4 shows 14 % which is right at the lower knee at ruffly 3.18 volts. Your graph shows almost 3.38 at 14% and this is definitely wrong.
2.5V to 4.2V are the extreme limits of discharge and charge without immediate damage on LiFePo4. There is little reason to push the cells to these limits because they are well past the knees of the curve and the last .5V-.75v past each knee adds very little additional storage.
The bulk of the storage is obtained between 3.3V and 3.6V and most people will set their system up to be within that range. The most aggressive use will operate pretty close to these values, but a lot of people like to set things significantly less aggressive than this in order to prolong the life of the batteries. The key is to set the chargers and load to typically operate in your preferred range and set the BMS (2nd line of defense) at values that are outside the range of the Chargers and Loads but still within the 2.5V - 4.2V range. (if the system is working properly, it will never hit the BMS values). The trick is to set the BMS range as conservative as possible, but far enough outside the Charger/Load range to avoid unnecessary trips of the BMS.