I drove all of the old cars tonight and also received some test data from a few others. Thank you for sharing. I do think that the Ford Focus was a little bit of an overdog, but still worth keeping in the competition. The pre-1980's cars needed some drastic help. When I added Sport Hard tires to them, they felt more like the 90's and 2000's cars. I also made some PP adjustments to even things out a bit. When altering PP levels, it will never be totally equal as each of us have differing driving styles and differing tuning methods. My hope is that these new settings create a more diverse field. The Focus should still be competitive, but now it is a more difficult choice to walk away from some of the others.
Fiat 500 F '65 - Sport Hard Tires 450 PP
Ford Focus ST170 '03 - Comfort Soft Tires 400 PP
Honda Civic 1500 3 door 25i '83 - Comfort Soft Tires 415 PP
Honda CRX SiR '90 - Comfort Soft Tires 410 PP
Mini Cooper 1.3i '98 - Sport Hard Tires 425 PP
Peugeot 206 S16 '99 - Comfort Soft Tires 410 PP
VW Golf I Gti '76 - Sport Hard Tires 385 PP
Honda Life Step Van '72 - Sport Soft Tires 421 PP and Oil Change
There will be no changes to the newer cars at 450 PP. They are all pretty close with one possible overdog that is paired with one of the more difficult to tune older cars.
I will update the OP with these new regulations and extend the tuner deadline by a few days. Thanks for everyone's input and patience.