More toe out will improve your steering turn in, as will some positive caster, you could then fit a faster rack and your steering will be pin sharp. However, more toe in, positive camber, and a faster rack will all make your steering heavier.
Do all three and I suspect you'll definitely need power steering, the electric power steering kits from EZ Power Steering are very good, speed sensitive too which is exactly what you need
The bottom line is, anything you do to improve turn in will also make your steering heavier, and the only two effective tools you have to fight back are higher tyre pressures and power steering, tyre pressures being free and power steering being expensive
