Testing was done with a sweeping edge 3, smite 5, and looting 3 netherite sword. The test was done in hard mode with a perimeter to get the best rates. When using the player kill method on the farm, make sure to swing at the center of the block in the middle of the wither skeleton holding chamber to kill all wither skeletons in one sword swing for maximum efficiency.
The farm was made at the coordinates: x=-60, z=-350 on a double intersection on a world seed of 5803391038331020 (Oneblock skyblock world seed)