LTC4370 load sharing
It means that you need to consider the drop across the mosfet when your considering the voltage that the device can supply.

\$ \frac{I_L}{2}*Rds_{on} = V_{across mosfet}\$

this needs to be lower than 75mV for lower operation. So take your maximum load divide it by two and multiply it by Rdson then make sure its lower than 75mV for optimal performance. That number will also affect your regulated voltage as the mosfet will have a voltage drop across it.