Dave - great lilies. I don't have much luck with Asiatic lilies coming back - guess it is too warm here in the winters. A few of the LA and trumpet lilies survive a few years.
I bought two varieties of Oriental-Trumpet hybrid a couple of years ago and I think I found the right one for my area. All 8 bulbs came back, and the Belladonna has produced many good sized bulbs from the main one. Here is one in bloom.