Quite a story and you were certainly patient, waitng for the first Not Chocolate daisy and then the real one. I discovered this at our local native plant nursery which also sells 2" Mediterranean plants. It has grown and bloomed but stayed small for three years here in my California mountain garden at 3000'. I saw a wonderful example at a native botanical garden at a historical home in Southern California that was about 2 feet tall. Mine smell just like chocolate. I tried wintersowing them but no go. BTW, I have some Ox-eye daisies , Leucanthemum vulgare, which are tall and white. I'll have to check out Heliopsis as that looks pretty, too.
The "real" chocolate daisy hasn't ever grown more than maybe 18 inches tall for me... but it's sure tough. My original plant didn't make it through last winter for whatever reason, but I did have a volunteer that grew and bloomed just fine... coming up between two patio pavers! I had to make sure I collected seeds, so DH was under strict orders not to "helpfully" pull it. LOL
Fun to hear about favorite plants (chocolate and also oxeye daisy) that grow from coast to coast! Thanks for posting.