using torque to alighn an object with surface

Im attempting to create a whipeout like game where i have a hovering vehicle 'sticking' to the road surface.

Currently i have a ray going down from the vehicle to get the normal of the surface its supposed to align with, and i want to use AddTorque so its smooth with later physics.

The issue im having is getting a relative rotation that i can add as torque.

current code works, until i start going on steeper slopes, tho only on near vertical surfaces, at which point is starts turning it in the relative y direction. Works fine upside down tho.

 void alighnWithRoad(RaycastHit hit)
     {
 
         float xDelta = ((Mathf.Atan2(trans.up.y,trans.up.z)) - (Mathf.Atan2(hit.normal.y,hit.normal.z)))* Mathf.Rad2Deg ;
         float zDelta = ((Mathf.Atan2(hit.normal.y,hit.normal.x)) - (Mathf.Atan2(trans.up.y,trans.up.x)))* Mathf.Rad2Deg ;
 
         if(xDelta > 180){
             xDelta -= 360;
         }
         else if(xDelta < -180){
             xDelta += 360;
         }
         if(zDelta > 180){
             zDelta -= 360;
         }
         else if(zDelta < -180){
             zDelta += 360;
         }
         
         rigBody.AddTorque(new Vector3(xDelta,0,zDelta) * 6f,ForceMode.Acceleration);
 
 
     }