Precision landing problem

I’m testing precision landing.
Sometimes it feels like it’s working very well
On another day, we land far away from beacon.
(On a windy day, it was confirmed that beacon was entered correctly in PX4 LOG.)
I installed an irlock at the bottom of the center of the aircraft, a distance measurement sensor, and entered the RTL option.

PARAMETER has changed two things as below.

PLD_FAPPR_ALT : 0.1 (default) ->1 and
PLD_HACC_RAD : 0.2 (default) → 1.5 changed.

I think there is an optimized parameter value, can you tell me?