Bouncing items

Hi,

I would like to get barrel that can be hit and bounced by car.

Here is datablock used by my dynamic barrels:

datablock ItemData( DynBarrel )
{
  mass = 1;
  sticky = true; // See further...
  category = "Addons";
  className = "DynBarrel";
  shapeFile = "~/data/shapes/misc/barrel1.dts";
  static = false;
  rotate = false;
};

And this is 'onCollision' handler:

function DynBarrel::onCollision( %this, %obj, %col, %vec, %speed )
{
  error( "DynBarrel is colliding with" SPC %col.getClassName() );

  %objPos = %obj.getPosition();
  %colPos = %col.getPosition();
  %impulseVec = VectorSub( %objPos, %colPos );
  %vX = getWord( %impulseVec, 0 );
  %vY = getWord( %impulseVec, 1 );
  // Limit movement to horizontal plane...
  %impulseVec = %vX SPC %vY SPC "0";
  %impulseVec = VectorNormalize( %impulseVec );
  %impulseVec = VectorScale( %impulseVec, 50 );
  %obj.applyImpulse( %objPos, %impulseVec );
}

All above works fine except that there is some gap between message 'DynBarrel is colliding...' and actual action. I manage to pass the barrel and it takes about 1 sec. to apply impulse to it, which looks really weird.
Another problem: when barrel lands on slope of the hill (name it 'landPos') it starts sliding down, then instantly move back to the 'landPos' and repeats that constantly. I tried to set sticky to 1, but now it is much harder to move barrel at all...

I would be very grateful for any help...