When I replaced my front brakes on my E320 I did not notice any difference in stopping distance.

Whenever I do a brake job I also bleed the brake lines but I bleed all four brake lines not just the two I am replacing.

Did you clean off the protective coating on your new rotors? I use brake cleaner to remove the protective coating.

I also "break-in" the new brakes by gradually coming to a stop from 20 MPH, 35 MPH, 40 MPH, and 45 MPH allowing time between for the rotors to cool.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles