@User: How does your test differ from

skywater-pdk/libraries/sky130_fd_pr/latest/cells/res_xhigh_po/tests/sky130_fd_pr__res_xhigh_po_0p35__resval_test.spice

? That uses W=0.35, L=10 and has a result of R=57697, which looks about right (2000*L/W = 57142, then add the resistance of the end caps).