While I'm no Kamui expert, my wife and I have gone though several of their tips. We had been using Kamui Black Soft tips up until the last tip change where I put on a Kamui Clear Medium and she an Ultraskin Soft. I'd say the Kamui Clear Black Medium when new does feel a lot like a Kamui Black Soft does when it's on the last couple of layers.
Both the Kamui Clear Medium and Ultraskin Soft gave us the desired result of not mushrooming or getting out of shape compared to the Kamui Black Soft tips but she has the undesirable effect of miscuing a lot with her Ultraskin soft. It glazes over in about 5 or 6 days and needs to be roughed up to hold chalk. I doubt the Ultraskin Soft will last nearly as long as the Kamui Black Soft did because it needs attention much more frequently (minimum once per week vs. max once per 6-8 weeks with Kamui).
Even though she's only had the Ultraskin Soft tip for about a month, I don't think I'll be able to hold off on changing her tip back to a Kamui Black Soft for much longer. Every time she miscues she looks over at me with an angry look and I can hear her first comment to me "How could you be so cheap to try to save $20 on a cue tip when you don't even have a cheap bone in your body?" I'll never make that mistake again.
Meanwhile, I'm happy with my Kamui Clear Black Medium which has a crisp, firm hit. I'm more used to the Kamiu Soft and prefer that feel but I do like that my tip profile hasn't changed one bit in a month. I don't have any glazing or miscue problems with the Kamui Medium tip either. Bottom line, stick with the Kamui Black, I'd recommend trying the Medium if you're not already accustomed to a soft tip, they hold up better. I think the Kamui Clear Black Medium will be my go to tip from here on out.