I have ridden in Kauai, and am familiar with "Hawaiian Ice". I would describe it as hardpack with a few mm coating of moly grease! Its even a bitch to walk on. On the pure clay surface there is no underlying traction like a rock or log, so its a tough call. I was on a heavier, smoother 4-stroke and was happy I was after getting through some of those sections. In other areas of the technical Kauai terrain, they would work great.
The Mitas and Dunlop are are more durable than the Michelin and IRC. We tear the Michelins up quick here (sidewalls) in the sharp rocks, IRCs fare a bit better. The Mitas and Dunlop are a bit stiffer, and while absolute traction is not as great as the X-11, its a much more reliable and practical tire to run on a woods bike and works great. No sidewall tears in several years. You run them slightly lower in pressure.
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