Self intruding posterior teeth when using Invisalign

I'm a 28 years old girl. I started invisalign to correct my slightly crooked. Besides, I have too much maxillary height. My ortho said it would improve a bit but to get perfect results I should undergo surgery (and I won't). I've read that invisalign tends to intrude the posterior region due to the forces applied when wearing the trays. I wonder if I could intentionally put a constant pressure when wearing the trays that could cause more intrusion than the originally expected.