Thanks so much for your input Tom. The softer front springs and heavier front bar makes good sense to me. I think the 120Y bar is 19mm. I might also remove the extra rear leaf and add a soft bar.

The camber and toe at the rear is from just bending the diff housing. I use a length of rail iron and some risers and clamps to secure the housing at the right pinion angle. Then use a bottle jack to bend the camber into it using vertical straight edges clamped to the outer flanges to measure the camber as im bending. The housing is rotated 90 degress to adjust the toe.

I also have a much larger difference in front to rear track than you. My front is about 70mm wider. I can adjust this with rear spacers though. Absolutely worth a try as well.

My car works well at the tighter tracks, but ive always struggled at Phillip Island. The four fastest corners are from between 160 and 180Kmh. It needs to have a little push through these to be able to pick up the throttle early. Its not fun when the back wants to swap ends at these speeds!

Im also wondering if a little more rake may help as well. These things seem to get light in the rear with the shape they are. If I lift the rear slightly it may reduce the rear lift.

I'll go out now and measure some bars to see what may work.

The car was slightly slower now with the extra rear leaf and the stiffer springs, but it was someone else driving the car that hasn't driven it before, so its hard to say definitively if the car is faster or not.

Thanks again