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Problems with LT8330 12V to 15V design

We're struggling to make a LT8330 boost 12Vin to 15Vout in a circuit very alike the proposed at datasheet. In simulations it runs fine, but at the bench it doen't work at all.

When it runs with no load at all I can measure 15V at the output, but with a tiny load like 5mA the voltage drops to 11V with some "bumps" .

The schottky diode is the  recommended in datasheet's Table 3.

Does anyone know what could be? Any hints?

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