Use the Sancho Mod and/or the official walkthrough. Links in the OP. If you don't go into details and nuances (there's a walkthrough for that) - just act like a scumbag, and your Kane's evil points will grow like on yeast. And yes, if you plan to go far as a Dom, it's worth remembering that your Kane and Olivia should share a common moral compass (if Kane is evil, Olivia should be evil, same goes for Good K and O). Of course, no one is stopping you from making an evil Kane and a good Olivia (or vice versa), but these will slow your progression upwards.
I'm playing a GoodKane, while maxing all the "Power Duo" points, yet EvilSis has more/better content between the two (not by much, but it's there). So my "9 Evil points" are strictly from the SisAlliance choices, and a few evil choices that I as a sadist/player actually want, such as:
"I'm sorry Amy, but I'm too much of a natural sadist to NOT shock you when given the power, but since I don't want to lose Princess points, I'm going to have to make Olivia evil, and then shock you to the max. But don't worry, I'll protect you from Chanel, and you'll like our time with Raven, I promise."
You're right... I wrote about it here once before too. We misunderstand Kane by judging his level of knowledge of what's going on around him based on our own level...And then we accuse him of stupidity...But I'll say more (and I think I won't be wrong) - most of the players who didn't come to our thread, didn't participate in the discussion and didn't get into the details and nuances of the game, simply won't notice anything funny/unusual in the fact that Kane didn't turn out to be Sherlock Holmes and didn't unravel the whole tangle by a couple of hints and reservations of the characters...And what is obvious for some, can be completely unobvious for others.
I would like to point out that all of Olivia's knowledge was also handed to her (father, mother, OG Gambit), whereas Kane, as non-Gameshow Veronica reveals in this episode, is intentionally kept in the dark, and anyone who gives him unauthorized information is going to get penalized. There may have been critical information ON THAT FUCKING BRACELET that we lost, and has never come back into play, or mentioned since. Therefore, "intelligent" Olivia didn't have to figure anything out, while Kane has to piece things together, while always learning something new about KG that he needs to remember, always balancing on a thread knowing that a single wrong choice could have have dire consequences on his life, and being near constantly juiced up on testosterone, which involves blood flow to the brain being siphoned to his second head. While I really want the famous Cole-Callista intelligence to actually manifest in him, he doesn't exactly have the cognitive surplus to dedicate to the hidden mysteries that aren't directly affecting his life/progress.