Should I be conservative about setting the output voltage of the CV phase of Li-Ion charging
There are an infinite number of profile paths to get to a given SoC.

At a low enough current rate, holding Absorb / CV long enough can overcharge even at a much lower voltage.

Overcharge meaning "losing significant life cycles if done consistently".

The good news is, very little usable SoC Ah capacity is lost by incrementally dropping Voltage, or stopping charge at a higher / earlier endAmps setpoint.

So, yes, if your regulation is sloppy, be very conservative. You could even at low C rates, "just stop" at a voltage setpoint, no CV at all, and sacrifice under 3% capacity.

At high C rates, can be less conservative, any resting voltage with the batt isolated over 3.6-7 is "close enough" to full if you can't measure actual SoC through controlled load testing.