I wish I could answer. But it WAS a clear day and he has a lot of Bearcat time, so maybe the insttrument hadn't been yet overhauled, can't say. I can ask when he gets back from Sun 'n Fun. He's on the crew flying the Lockheed Canstellation down there just now.
Since the Constellation is a private airplane now, it doesn't fly with an operational passenger load anymore, so it climbs quite nicely! Empty airliners are overpowered!