You could take it to one of those fitting stations where they fit it properly for you.
They would be able to tell you for sure whether it's fitting correctly and where it should go.
From what I remember the capsule or seat shouldn't touch the front seats at all, not sure about the base length.

We are about to buy a new Forrester so I am interested to see what happens with it.
We haven't decided on car seats yet.

Good Luck I hope it fits!!