polygonOffset wireframe doesn't work with other material offsets

Questions
1

Here are my settings for the materials…

            material[num].texture.polygonOffset = true;
	material[num].texture.polygonOffsetFactor = -10;
	material[num].texture.polygonOffsetUnits = 0.1;
	material[num].texture.needsUpdate = true;
	
	material[num].flat.polygonOffset = true;
	material[num].flat.polygonOffsetFactor = -10;
	material[num].flat.polygonOffsetUnits = 0.1;
	material[num].flat.needsUpdate = true;
	
	material[num].wireframe.polygonOffset = true;
	material[num].wireframe.polygonOffsetFactor = -20;
	material[num].wireframe.polygonOffsetUnits = 0.1;
	material[num].wireframe.needsUpdate = true;
	
	material[num].hoverWireframe.polygonOffset = true;
	material[num].hoverWireframe.polygonOffsetFactor = -20;
	material[num].hoverWireframe.polygonOffsetUnits = 0.1;
	material[num].hoverWireframe.needsUpdate = true;

The problem is that the wireframe always is z-fighting with the texture material (so parts of the wireframe get hidden), even though the texture material isn’t being offset as much as the wireframe.
How do I fix this? I need to be able to offset in the negative direction and have the wireframe be in front of the texture.

2

Okay, so for a workaround, I’m just going to adjust the values to be positive since negative values don’t work for wireframes…

	material[num].texture.polygonOffset = true;
	material[num].texture.polygonOffsetFactor = (100 + imgDecal[num].offset) * 0.0075;
	material[num].texture.polygonOffsetUnits = 0.1;
	material[num].texture.needsUpdate = true;
	
	material[num].flat.polygonOffset = true;
	material[num].flat.polygonOffsetFactor = (100 + imgDecal[num].offset) * 0.0075;
	material[num].flat.polygonOffsetUnits = 0.1;
	material[num].flat.needsUpdate = true;
	
	material[num].wireframe.polygonOffset = true;
	material[num].wireframe.polygonOffsetFactor = (100 + -5 + imgDecal[num].offset) * 0.0075;
	material[num].wireframe.polygonOffsetUnits = 0.1;
	material[num].wireframe.needsUpdate = true;
	
	material[num].hoverWireframe.polygonOffset = true;
	material[num].hoverWireframe.polygonOffsetFactor = (100 + -5 + imgDecal[num].offset) * 0.0075;
	material[num].hoverWireframe.polygonOffsetUnits = 0.1;
	material[num].hoverWireframe.needsUpdate = true;

This seems to look alright.