The curious side of me decided to keep this bottle of 63 Dow to open and share with friends for New Year's Eve rather than return it due to the difference in reported vs actual ullage (I did bring a back up bottle, though, in the event that this one was dead).
We opened it about 5:30p and strained it into a ship's decanter to let it sit until the kids were in bed. We tried a bit right away. The color is not as dark as I was expecting, certainly not as dark as the 2003 Taylor LBV I had opened the week before. The predominant flavors were alcohol and fruit, in that order - not much to my liking at first. Figuring it needed to sit for another few hours, we sampled it again at 7:30p. At this point, it was beginning to show some promise with a decreased alcohol flavor and increased fruit flavors. A distinct dark cherry flavor was definitely evolving with an interesting finish that was showing some complexity. I was definitely encouraged by this, so we came back about 9:30 (now 4 hours after opening/decanting) and things were really getting good at this point. The alcohol flavor had largely disappeared and was replaced by a nice medly of fruit flavors, still strong on cherry in the finish. The aroma was opening up nicely as well, so we switched over to larger glasses. With other tasty treats along the way, we kept pouring

from the decanter until about 1:00a or so when it eventually ran dry... My impression was that by 11:00p (nearly 6 hours after opening) it was at its best. It was much smoother and had developed a more complex fruit/cherry flavor and had the longest finish. Despite my misgivings about the bottle condition, it turned out to be a wonderful experience!
The bad part is now my collection of VP is down to 4 bottles. In planning a path forward, I think I'll focus mostly on younger vintages purchased several bottles at a time, with an occasional older bottle for enjoying sooner rather than later... The trick is that there are relatively few places where I can make in-person purchases (I live in PA, so the state runs the liquor stores and restricts shipments from other states), so I'm stuck with a small handful of stores in Northern NJ and southeast NY state.
Eric