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LTC4412 switching to different input

I am prototyping the LTC4412 and I have a question on how to improve my design.

My circuit is like Figure 2 of the datasheet.

 

(Sense pin is connected to Out).

The design works and switches to higher input but only if the difference in input voltages is above 0.8V.

In fact, it depends on the load. My tests are in the following table.

Load

Input voltage difference
to switch to higher input 

100mA 0.6V
200mA 0.8V
500mA 1.2V
1A 1.6V

Am I doing something wrong?