I'm still of the opinion PP simply doesn't work when you have such a wide variety of car types, especially those VGTs.
Imagine if PP was calculated in real life, and was used to determine entry into GT500 races. If you make that the only restriction then you'd get all manner of differently shaped cars, different powertrains, anything.
It doesn't work. Restrictions have to be FAR tighter if you want any hope of fair and competitive races. You can't set up an 850PP race and just let anything that makes that limit enter the race, you end up with modern LMPs, old Sports Cars, GT500, random ass VGTs with made up performance figures, it's a mess that BoP could never solve.
No, just stick to restrictions as used in real life.
Width
Length
Weight
height
Max engine displacement
Allowed engine configs
Driven wheels
Turbo allowed or not
Fixed Aero / Active Aero / No Extra Aero
etc etc
That will create far better races than PP free for alls. The single player events so far as so unimaginative and open in restrictions right now. The "WTC [PP]" races are the worst offenders. It shouldn't matter what PP exploits you find, something that looks like this:
Should not be in a "World Touring Car" event. It's silly.