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Ltc3115-2 design problem

Hello, I am currently working on the ltc3115-2 and I am experiencing a design problem.

My goal is to be able to provide a voltage of 24Vdc and a current of 2A; with an input voltage between 20-28Vdc.

Currently, I have made my schematic as follows:

As you can see on LT-Spice, I get the desired output current and voltage.

In reality, with an input voltage of 28Vdc, i.e. in buck mode, I have no problems and I get my desired current and voltage.
However in boost mode, the output voltage drops and the output current is much lower than the 2A expected.

Could you help me to solve my problem?