Interesting. I run K60's, and although I don't do much off road stuff they are holding up very well on my F 800 even when sometimes fully loaded. 12,000Kms so far and no problems.
Can't help noticing that all the issues you've had are on one side of the tyre, which could suggest acute stress on one side , perhaps caused by the tracking being slightly out and overheating up one side of the tyre more than the other, with the subsequent failure.
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