In addition your k-point grid looks strange siesta: k-grid: 0 0 8 0.500 siesta: k-grid: 0 2 0 0.500 siesta: k-grid: 2 0 0 0.500
maybe try something like siesta: k-grid: 1 0 0 0.000 siesta: k-grid: 0 1 0 0.000 siesta: k-grid: 0 0 30 0.000 you only need k-points along the axis.
