Don't add it. If the LSD clutches act up, add an ounce, drive it for a few hours. If they still act up, add another ounce. I doubt you will actually need any (I never have).
To check if the clutches are acting up, get the rear diff oil up to temp. That will take about an hour of driving. Come to a complete stop, turn hard right or left and slowly accelerate. If you feel a shutter, add an ounce of the modifier. Drive it for a few more hours so that the modifier has time to soak all the way through the clutch pack, and try again. You are trying to find the balance of just enough modifier, too much and the clutches will just slip and be ineffective, not enough and you will get chatter.