Raising Sound Stage

I am satisfied with the sound quality of my highs, mids, and bass. The problem is that I used coax in factory locations (calf level in the doors) for highs and the staging is not good. I would like to keep what I have but add additional tweeters up front to raise the sound stage. What's the best way to do this (wiring, xovers, etc.). I'm presently running 2 of 4 channels from a JL e4300 to power the front speakers at 4 ohms. Thanks for your input.