Swing axle suspension, how to improve handling??

[4agedub]

Hi guys
i have a historic racer (1969 beetle) with swing axle rear suspension. The rules does not allow us to change to irs. What mods can I look at to improve the handling?

This is my current setup:
-Dropped two splines
-KYB shocks all round
-19mm anti roll bar rear (z type like beetle original that mounts solid on axles)
-19mm (not too sure) front anti roll bar on front, beetle style
-removed link pins, installed rose joints to set camber on front
-lifted gearbox with a solid mounting to reduce rear camber to 1'.
-removed steering box and installed steering rack with long tie rods.
-front end has std select a drops.
-15" slicks 8" wide.
-discs front and back

What would you suggest I can do to improve the handling more?
The car tends to oversteer in the exit of the corners.

The engine is a 1776 type 1 for now... 2110cc in progress.

Thanks