Was great meeting you roastbeef.
Did a little write up of my tire misadventure here - about why mixing types of tires is bad:
http://www.m3post.com/forums/showthread.php?t=1175708
Car really felt like she was trying to kill me for doing that - completely unpredictable. Did not want to go hard into turns because I felt like even braking would cause me to spin. It was way better after a friend showed me one weird trick (tire shops hate him!) - by overinflating the front tires to decrease the contact patch, I could get the tire grip to match the ones in the rear.
I don't know how you track these Pilot Sport 2s Killerfish - these things kinda suck. These could have been on the shelf at the tire store for 8 years though, aren't these types of tires super old?