You're working at this all backwards.
If you want to play at the track, you have to FIRST have a proper suspension setup and then add power.
You've added a ton of power and now you're trying to band-aid pieces here and there.
'04 Mach 1. Built. Turbo. 667whp/631wtq
'06 Focus. Built. Turbo. WMI. (sold)
'03 Mach 1 : 12.61 @ 106.59 (sold)