Damascenia 185 SA is a Firmenich base, The Good Scents company sells it. Rosessence may well be a Firmenich base as well, but I'm to sure. I have no idea about the others although they sound like general synthetic rose bases, of which there are a lot. Have you tried the Perfumer's Apprentice for some good Rose bases.
Rose Otto contains Geraniol, Citronellol, Nerol, Geranyl Acetate, Citronellyl Acetate, Neryl Acetate, alpha Damascone, beta Damascone and a little Phenyl Ethyl Alcohol. Small amounts of Linalol, Farnesol and Eugenol are also present. To help with your candle I would also consider using alpha Ionone, Cinnamic alcohol and some Rosone even though they are not present in the natural Otto. A touch of Aldehyde C11 lenic will improve the performance.