Once upon a time, we had crappy cross ply tyres.
What people would do is fit narrower tyres to wider rims, the prupose of this was to stiffen the sidewall. Remember back then tyres of 70 profile plus was the norm, so there was a lot of flex.
Now with tyre technology that it is, stiff sidewalls, low profile tyres all stretching tyres like the photo shows (so much you can see the inside of the lip) is stuff up how the tyre and suspension works (tyres are part of suspension also)
Anyway, now to answer the post.
Streetunit sucks
6 MPS is difficult to find a wheel that looks right anda good fit because of the shape of the guards.
You have a good size wheel for practicality and performance (assuming offset is sensable)
To get that "look" you want for whatever reason i doubt i'll ever understand, you want wider wheels with more offset, adjustable camber, and a mate at a tyre shop if you plan to actually drive your car
2013 Ford Focus ST - Performance Blue, Cobb AP
Gone 2006 3 MPS Sports - True Red, Koni FSD shocks, in dash OEM look Ebay GPS/DVD, Hypertech, RX8 Rims