Although I amazed at such a high attenuation number, and give props for such an acheivement, that final gravity does seem kinda low to me as well. My trappist was 1.019 when I bottled it. The only beer I had drop below 1.010 was one with an OG of only 1.037. Did you taste it when you racked it to secondary? If it seems too dry, you could still add some lactose to it when bottling. Let us know.