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They may be overfilled and hydro lock when they get hot and the oil expands?
Have you tried messing with the adjusters when it's hot to see if anything changes? What settings are you running now F & R?
I was running the bandit reccomendations, 5.5f 4.5r, I went to 4.5f 3.5r and it's dramatically better, but same as before, only for the first ~30 mins of ride.