Hydro - steering stability

Hello,

How to have the hydro stay straight in acceleration , and when we turn the hydro turn in the good direction.
I tried something like that:

Code:

"hydros": [
      [ "id1:", "id2:" ],
      /*{
        "beamPrecompression": 1.0,
        "beamType": "|NORMAL",
        "beamLongBound": 1,
        "beamShortBound": 1
      },*/
      {
        "beamSpring": 15000, //longueur
        "beamDamp": 50, //rebondit
        "beamDeform": 2000000, //deforme
        "beamStrength": "FLT_MAX" // casse
      },


      [
        "fw1ll",
        "ch69",
        {
          "factor": -0.15, //-
          "steeringWheelLock": 450,
          "inRate": 1.25,
          "outRate": 1.25,
          "inputSource": "steering_input"

        }
      ],
      [
        "fw1ll",
        "ch70",
        {
          "factor":0.15,
          "steeringWheelLock": 450,
          "inRate": 1.25,
          "outRate": 1.25,
          "inputSource": "steering_input"

        }
      ],
    

      [
        "fw1rr",
        "ch83",
        {
          "factor": 0.15,
          "steeringWheelLock": 450,
          "inRate": 1.25,
          "outRate": 1.25,
          "inputSource": "steering_input"

        }
      ],
      [
        "fw1rr",
        "ch82",
        {
          "factor": -0.15, //-
          "steeringWheelLock": 450,
          "inRate": 1.25,
          "outRate": 1.25,
          "inputSource": "steering_input"

        }
      ],
  
      {
        "beamPrecompression": 1.0,
        "beamType": "|NORMAL",
        "beamLongBound": 1,
        "beamShortBound": 1
      }



    ],

Somebody can help me PLS.