Here's the situation. If the battery is over 80% SOC it can't accept a high charging current. You can force it to accept more current by increasing the charging voltage. But you're only increasing the batteries surface charge. The higher the surface charge, the greater the gassing and the lower the efficiency. Coulomb efficiency will drop below 50%. That means less than half the current is charging the battery and the greater proportion is boiling the battery (as well as heating it up).
It's foolhardy to think 14.7V and 10A does a better job than 14.0V and 6A. At 14V, the efficiency is greatly improved.