8.5 oz. of maple sugar in 5 gallons is less than 4 points on the gravity. You have over ten times as much LME by weight and LME has a much higher sugar content than maple syrup. You're at 70% attenuation, so don't expect much more.
An ounce of Chinook will pack a punch, it will mellow a bit, but it can be really harsh.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk