please read "PS4" in page 6 in this pdf,
and change the āStrength Percentageā in āRight Stick Settingsā to 30 or other smaller numbers.
it will help you.
PS4: Strength of RS_Down will be effected by āStrength Percentageā in āRight Stick Settingsā, you can set a suitable value for recoiling, whatever this āStrength Percentageā be activated or not.