I've got almost a year on my current Kamui Black Soft...about ready to replace, but it's absolutely perfect. It's probably a medium hard tip, now. It took about 3 months to harden up to where it is now, but I was playing lights out with it from the start. It will harden to your playing style (how firm you generally hit) and requires almost no maintenance. It helps to keep the tip at no more than a nickel radius or flatter, it works much better that way, I hardly ever miss-cue and still get all the action/juice I want.
Cutting it down may help, but it will still play soft for a while. I lightly pick the surface when it glazes over (once every 12 hours of play or so), just don't dig in or twist the pick. Once I get the bevel right, I never need to redo it, the chalk will slowly wear down the tip in the same bevel if you chalk correctly, and normal play will keep the tip at the desire shape and hardness, too. It's my favorite tip of all time.