You literally did everything wrong that you could have done wrong to end up with a score of 11. This isn't poor design this is poor ability on your part.
Oh but I was role playing!
So you were role playing a crappy diplomat with no ability to be coy or anything. I ended up with a score of 100 despite starting off with -10 for being a mage and no I didn't find all of the halla statues. So uhhh you just did it all wrong. Sorry this is your fault. I don't like the timer either but it gives some reality to the fact that you're an important guest whose presence would be missed. If you could just go off and do what you wanted it would be like the President of the USA ducking out on a state dinner and expecting no one to notice.
people cry for realism and when they get it they cry even harder. Go away.
Being a good diplomat or leader or negotiator is about far more than being coy, not that they get that in this mission. This set up cried out for other manipulation options. The Orlesians are expecting you to be a crass obvious boorish foreigner who reveals too much and is easy to read. They think they're the masters of refinement and subtlety. You could play off of that, letting the right details "slip" to the right people, acting like a bit of a twit so that people drop their guard. Being loud and obnoxious while secretly watching for what and how people react. Everyone here is so used to being coy that many are likely unpracticed at holding their reactions when startled. You could slip something into the drinks to help loosen tongues . . .
. . . Then, when you need them to respect you, after you've played those cards, you can lower the boom by subtly revealing what you've picked up on and hints of how you've been playing them. Just enough to make them guess. Make them panic. Have your plants watch for reactions.
Alternately, you could just read the situation, figure out what the Orlesians need from you (all of it, not just the obvious) and structure and enticing deal as the basis for your alliance. All the strutting and preening in the world is useless when you know what your prospective customer needs and how badly they need it. You can wait them out till they're done with their dog and pony show.
Being coy only tells them you know how to act like a common Orlesian twit.