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I too have the Tronxy XY-08n. My fine tune Adjustment for mine is as follows on lines 589 through 591 in Configuration.h:

define X_PROBE_OFFSET_FROM_EXTRUDER -19 // X offset: -left +right [of the nozzle]

define Y_PROBE_OFFSET_FROM_EXTRUDER -46 // Y offset: -front +behind [the nozzle]

define Z_PROBE_OFFSET_FROM_EXTRUDER 0 // Z offset: -below +above [the nozzle]

I have found that to be pretty much smack dab in the center for the sensor :)