Yeah, I do think that a succubus build with COM as the primary stat would be better in the long run than one with Constitution. Still, since it was my first playthrough, I believe having high Constitution helped me a lot, as I had a lot of HP and stamina to compensate for many wrong decisions I made during the game. By the way, is it even possible to beat the Mad Beast using only Juicing? I tried for a few minutes and ultimately gave up, which is why I think a Succubus COM build would be better.