how do I get past 10 influence
To get to 11 influence previously, the best way was to not force Priti. Tricking her and giving Wilson the pics gives you 11. Tricking her and keeping them yourself also gets you 11, and access to the online porn scene with Candy, as well as the whole scene in slide 7 on the right of this screen.
You have to advance all of the early quests to finish Ruth's, as doing so (and passing the rule allowing you to spank the girls yourself) will start chapter 2.