Be warned LiFePo4 cells are likely to get damaged >3.5V/cell IMHO.
You need to characterize your own cells & look for the point where the voltage starts to climb quickly on charge & drop quickly on discharge.
These points are where damage & swelling will start & there are many tails of woe re swelling cells.
The manufacturers seem to give these higher voltages (3.65 or more) to maximize the apparent capacity but max reported capacity does not equal long life....
For my LiFePo4's this is ~2.85V & 3.50V so I've set my system for ~2.9V min & ~3.41 max to "stay on the plateau" of the typical charge curve.
"Fully charged" SoC is still reached with a lower charge voltage when the tail current drops away.