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I found Horizons fine on the Chilterns stuff except for muddy sections where I'd just hit fast and hope to clear anyway and they're faster than knobbies on road obvs. They're still a drag compared to road tyres. I was thinking of using a road bike for my next gravel race. Just make it full on weight weenie roadie and then just walk everything technical. I wonder what difference to my speed it would make :)
Maybe they were just faster than you? :-*