I remember my first go around Winton - circulating in about 2:10 while my nephew did mid-low 1:50s in his 1970's celica (!)
I put this down to the timekeeping
And I cooked the engine too....
yikes.
never had any trouble with the cooling in street conditions - the track is a harsh environment.
anyway - if you search you'll find some fairly consistent recommendations on set-up geometry.
If you are running harder street tyres then letting the body roll over the top of them is better and the stickier the tires the more you can firm up the roll
this car started the corner with 4inches of clearance under the sidepipe...
might try putting the sway-bar back on ...
good luck with your set up
LoBelly