My advice to you from my experience would be to stick with the parts you have now and go back out and play around with tyre pressures and your driving style and line. I am not trying to be condescending or discourage you but this is what I wish I had done instead of throwing parts at my car :).
If you think your car is scrubbing at the front maybe it might just be wise to raise it up.
Also I would look into optimising your alignment because this has a very significant role in the handling of the car and how suited it is to your style.

