Hard to tell what happened to your toes, I suspect the humidity doesn't help. I always lube the tops of my toes for very long runs. However I ran WS100 5 weeks ago and I lost 3 toenails, I didn't even feel two of them bothering me during the race. One hurt horribly for the last 40 miles, but the damage was already done.
Any time there is wet clothing rubbing across skin for long enough it rubs the skin raw, either try lube of socks that don't bunch or slide across the skin.
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