+ 30 will be fine, you will just have to roll the lip on the rear guard or just run a tyre size down so they are a little more stretched.
I just would be careful on the front guard.
Here is how a +35 sits on my car - as you can see its pretty flush up front. So +30 will sit 5mm further out, the rear will be fine with just a roll if needed, but the front guards are already rolled.
Honestly you will be fine with a stretched tyre.