Wow. People do still care about my project. Yay!
Well, as concerns the succubus, I think the Charisma is honestly high enough as is. It beats out what the Silver Dragon gets in only seven levels and matches it in five. I could make a racial PRC, but that's about the extent of what I'd be comfortable with without feedback from more people.
I'll see what I can do with your requests when I get the chance. First I need to attend to some requests my girlfriend made, and I have to go for abour 3 hours. Her requests are fairly low level is one of the reasons.