Exactly. Those are the molten waves (on your picture they look like honeycombs, those lines should be straight in the solid infill) that I am getting on First layer without cubeitmod!!! First I thought the z-axis offset was the problem that I set it to -.25 (too squished), but if you change that to 0, the gap is huge on the first layer.
First layer is not an issue with cubeitmod and you should set the z-axis offset back to 0.