Interesting. If you ever do track down the scuttlebutt on poor-performance internal regulators, please pass it along? I'm not terribly hard to find.
"Lastly, I'm not going to use the Oscilloquartz reference voltage to power the frequency setting circuit. It seems the logical thing to do, but this so called reference voltage is anything but a reference voltage. They are typically created by using a zener (reference) diode like the TL431, but that is simply not good enough as you will see."