My recommendation, get some tires and work on the driver mod. ST is going to change, and you'll want to consider how the focus fits into the 2012 ST before doing serious mods. It all depends on where you want to go in the future.
Are you running camberplates? I found going to LCR plates on my focus dramatically improved my cornering grip when I ran in ST.
Parking Lot Hero
2008 WRX daily driver
2003 ZX3 23D Autox Car 42 FSP
"Hella Functional - Raced, Not Hard Parked"