Whenever I do extract, I typically do 25/75 regular and late addition, and don't notice any appreciable color or hop utilization issues.
Everything I've read states that you need to have at least 15-20% of the fermentables in the normal early addition, as those sugars and enzymes aid in the release of hop acids/oils to allow consistent hop utilization. Hop utilization goes way down if they are just in water.
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!