Congrats! My jade vine is from seed from the plant in Miami. The owner, Jordon, happens to be a friend and is a member here on Bananas.org, JNStropic. You should contact him for advice on it, he was entirely successful with germinating them. He is also one of the first people to have Ae Ae down here in Miami over 40 years ago.
Regarding your comment that its "every once in a while" I dont think is entirely true. I think it happened just once, last year, in all his time with the vine. And he has had it a loooong time. Cheers though and congrats!
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