Looks like a model issue, not a specifically a slicer or printer issue. Straight lines get formed between infill lines regardless of what the slicer says – filament is stretched between two points and takes the shortest path creating straight lines. I’d be reducing the layer height and increasing or changing the infill type. Feel free to send the model file and ill print one perfectly and send you my settings.
Also, worth checking that the X axis is perpendicular to the Y axis, if not, loosen the grub screws on the GT2 Pulleys on either the left or right side of the Y transfer rod and pull the X carriage square before re tightening.