30et is to wide on a a4 et35 is the max
The perfect fitment I found was 8.5" width with ET32
I think the perfect ET is a personal thing depending on the look you want, although Greenys does look good it has a little too much poke for me,I prefer the wheels to sit about 1-2mm inside the arches but then I'm after the slightly enhanced OEM look. I will be trying spacers again with my wheels so will end up with a front ET of 35 and a rear ET of 28.
I don't like spacers and have never had a set that don't vibrate and I have only every used H&R ones, although they have been second hand, however to get the perfect stance I will have to use them. As I said poke is not for me but each to their own.When you've done it be sure to throw up some pictures.
30et is to wide on a a4 et35 is the max