Re the LSD in an alfetta, as it is only a 25% lock up (or 50% if tweaked with extra clutch plates) the inside wheel can still spin quite noticibly. A bit less roll stiffness at the back (or more at the front) will help put less emphasis on the diff for traction.
My GTV6 has way too little roll stiffness and despite having an LSD will lay big long black lines on the way out of second and third gear corners without a lot of provocation due to too much body roll (on the race track obviously
).