Racked and stabilized both batches today. The first batch may have been stuck or the yeast had attenuated. It started with a SG of 1.120, and I read it at 1.020 today. There has been no airlock activity for over two weeks. I'm guessing that Montrachet finishes or is tolerant to the 13-14% range. So that is probably as far as it will go without adding another yeast to it. The second batch started at 1.050 and was bone dry at 0.992 (7.8% ABV).
I tasted both batches, the first one was very sweet as you might imagine, but it has a good flavor that I think will balance out well when I blend and bottle the two together. The second batch was dry and very tart (acidic).