I also prefer Damaris.
Persephone Victoria- Love this name, but I'm not sure that I'd put Persephone with Victoria, as they are both 4 syllables. I love that Persephone hits that perfectly unique medium for me. It's not so out there as to raise eyebrows, but it is unique enough that I've never actually met a Persephone. I'd be overjoyed to meet a young Persephone. Also, it has an -i/-e/-ie sound at the end to match Vashti. It's a nice thing to link them together...
Senara Victoria- I don't like the -a -a endings.
Damaris Victoria- Sorry, too out there for me. Although I know Damaris is a real name, it always sounds made up for me (probably because I knew a D'Maris).
Damaris is very cool!