Castor- Positive is how far forward from the axle centre line the wheel is being pulled(so closer to the front of the guard), Negative is the reverse.
Camber- Is the angle of the wheel, eg, top of the wheel tilted towards the vehicle is negative camber, top away from the vehicle is negative camber
Toe- is the wheel being pointed in or out(towards/away) from the middle of the car(best explanation i can give without waving my hands around )
for rear camber- i am guessing 9'o'clock on the left and 3 on the right?
castor will increase steering feel, other than that you can get a valve changed in your power steering but we will leave that for another time i run ~5deg +ve castor, which is the max on the adjustable bushes i have.
Where are you located?