Oh no @leaky20 I found the survey a while ago (not on social media though).
We seem to be quite similar. Despite being a lower scorer than you in agreeableness (54%) I, also, sometimes find myself agreeing with people, so then things don't get prolonged; but then, I still think about it when I get back home. I understand studies suggest that we become more agreeable with age, I actually have become less. I saw the need to be more assertive!
The funny thing is, even though I am able to speak up now, I find confrontation incredibly upsetting. Perhaps, I haven't really changed. My brother is a high scorer on agreeableness too (more like you), and since you mentioned your upbringing, I believe that for us (me and my brothers) it also stems from how we were brought up.
Finally, I also feel that, in order to have peace and calm in my days, I need to have everything under control. While being organized and structured has proved to be very fruitful for me, I am the type of person who doesn't cope well with last minute situations.
Well, there you go. I used you as my counselor here for a few minutes :P
You take care and have a lovely evening! :*