my shoulders encroach into the middle seat so i'm over the armrest
i tell people they are welcome to try but they usually give up
I was on a miserable flight from San Jose to Philly one time sandwiched between two guys that sound like your size... They didn't raise the arm-rests - but their shoulders were both encroaching into my middle seat... The guys were 50ish, heavy seat, and shoulders of former football players. And both hogged the armrests. I spent the entire flight leaning forward leaning on my elbows. It was awful.
I did try to scoot back so my back could touch the seat - but these guys were big and immovable. 6 hours of misery.
No more middle seats if I don't know a person on one side or the other (hubby, or one of my kids.) And I totally cede the armrest to the person in the middle... I have one on the aisle or window.