9 has a very manageable drawback. She's a bro and she'll be cool if she needs to leave now and again. 6 is only a serious problem if your morality is rooted in what you feel and not a sense of duty to an established moral code. I happen to be the latter, so 6 is an inconvenience. She's a paranoid dick, but I'll have plenty of awesome waifus to take the heat off. Plus I'll have 9, who is a bro. 1's supernatural power is actually beneficial if you only interact physically at night and fuck right before you want to go to bed. Also a dick, but worth it for superpowers.
Waifu A makes me better at having virtually any job. Not at actually doing the job, but at making people think I'm good at it, which counts for more than it should but whatever, A gives me the power to play that hand. Waifu K halts/reverses my aging until she dies, which will about double my lifespan. Waifus E and D have neat powers but mainly they're awesome personalities. That's four, though, so let's pick up black chi 2. She's tolerable in small doses and with eight wives in the harem I'll only see her in small doses, and her magical effect is fine on weekends.