i have the same tire size (205/45 16) on the same wheels but have bf goodrich g-force kdw tires. i also had a lot of issue with front end handling mainly because i couldn’t get the alignment right with a sagging crossmember. i jacked the crossmember out to the correct width and reinforced it and everything became much better. my other suggestions that helped me were:
1) make sure the konis are somewhere between middle and soft. hard is good on a smooth race track only.
2) bushings need to tightened enough to stop lateral movement there.
3) steering column joints nice and tight and good rubber in the mountings.
the ride is of course a little harsh but is now predictable and precise.