In the finest traditions of recommending what you already have, I’d suggest a Cotic Hemlock. Ticks all your boxes perfectly. Mine’s raced downhill * and done a tour de france climb And later in the year we’re off to fort william for the Hope endurance DH.
67 degrees HA as standard with a 160 fork which isn’t all that slack, but the 1.5 headtube allows a reducer headset so mine with its Lyriks sits somewhere between 65 and 65.5. Though to be fair, I do use the u-turn a bit, as I found that it’s slightly hard work to keep on track on sleep climbs, and I didn’t want to sacrifice the descending with a longer stem.
(* yes I was slow. No it wasn’t the bike’s fault)