Possible under-extrusion on infill

Hi everyone. Started a larger print tonight (V-Core 3 400), and noticed that the infill was a bit whispy and little parts were sticking up about the place. Looking closer and the infill seems to look under-extruded. Doing Cubic infill at 15%.
Just wondering if anyone else has come across this issue at all. The solid layers are all fine and I have run through the calibration which all seemed very good. Benchy and Voron Cube came out as exected when setting up.

Thanks in advance.
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