I rotate as well. I replace tires long before most would so any wear that gets moved to the front is no worse than if I left a tire on the front until my normal replacement. On slow years I will replace once a year on my main rig regardless of wear.
Sorry, but I get a longer useable life out of the tires when I do. In close to 20 years of riding I have not had any experience that would lead me change this technique.