Please excuse the dark image, downside to using a HDR monitor I suppose! Still, why is it pushing outside instead of inside the object? Very confused.
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Not sure what is going on with the extrude but the glaring thing is the double geometry along all the selected face loop. I would fix that first. That ‘hashing’ effect is telling you there is geometry in the same place and Blender does not know which one to show.
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increase world (icon) lighting.
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