Now that I've hit 1000 miles, I allowed the engine to hit roughly 5000 rpms before I shift. I know it's probably not needed, and that I can go to redline if I wanted, but I guess I'm crazy like that.
I'll probably do this for roughly another 500 miles, then increase to 6000 rpms for another 500, then finally 7000. I also still try to vary engine rpms on the highway too if possible.