There's no way I'd want to go that fast in any Stingray, pre or post ZP hull.
I've owned an older 19' Stingray as our ski-rec boat for years-it's a 1985 model pre-ZP and only has a 140 merc I/O 4 cylinder and it has been a great well-built boat. It runs low to mid 40's fully loaded, which is pretty good for that size and power. We use it at our property in Canada (North Channel of Lake Huron) and it rides pretty damn well. I've been told the older ones are much better at handling the waves than the newer ones. It's also incredibly good on fuel, especially when you're buying it by the liter!
I had a discussion about these boats with Paul Kermis once (Simrek drive showers)- he knows quite a bit about them, especially at speed, and would probably know whether this is all BS or not. I DO like that small block engine however- looks like a runner.