Wow that works really well! In fact prefer it to fixed head tbh
My wheels had a lot less poke than yours and rubbed on the arches under acceleration with eibach springs (spring savers are a solution altjough it does lift the back slightly). Coil overs will give you most options. You may have to look at the Grassbank narrow rear track kit - should solve things and it looks better. Hard to tell from this angle but looks like the front will be the problem - might be worth a chat with them about how they narrowed front track.
On the other hand might be worrying over nothing and you should just "Hard BREXIT"