I agree with @
CSG Mike. You want as much grip in the front as possible, there's plenty of room for tire in the rear. ESPECIALLY on stock power, a staggered setup is purely for looks.
The only time I can see doing a staggered setup for a performance application on this car is to get more grip in the rear on a very high power setup when the fronts are already maxed out size wise.
There are better ways to tune the limit characteristics of a car than forcefully limiting grip via tire size, especially in the front.
Think about it this way. 225 front 255 rear. The car pushes into corners but is very stable under power since it has a lot of rubber in the rear. Now. Take the fronts and replace them with 255's. You've done nothing to sacrifice the rear grip, but your front grip has potentially improved. You still have great grip under power because again, your rear grip hasn't changed. But now, if you wanted to, you could tune your suspension to have similar limit characteristics as your 225 front setup, but your front tires are breaking traction because of the suspension setup and not because they've reached their ultimate grip level sooner than the rears due to their smaller width. Your new wider front tires are giving you the same driving characteristics and at least equal grip, while having an easier time at it. This means lower tire temps, longer tire life, and a system that as you learn to drive faster and wish for a more neutral car, you can tune it to be that way with a few small mods instead of buying a new pair of front wheels.
Also. Comparing to Porsche or any other sports car is pointless. The 911 is a particularly bad example because it's weight distribution is the polar opposite of this car's with more than 60% of it's weight on the rear wheels and much of that being behind the wheels. Of course it runs staggered, because there's no other way to get the thing to handle in any kind of normal way.
Cheers
Nathan