I am literally telling you I ran 255/80/17s (a 33.1x 10.2 inch tire) for over 4 years with no body mount chop and no rub. I mapped the Red Clay Rally 2 of those years, and it wasn't until I went with a 285/75/17 that I required a BMC.
Also, you can't just say "285s aren't 33s, they're slightly smaller" I don't believe you are understanding how tires are measured because 285/75/17 is a 34x 11.1 inch tire.
So yes, you CAN run "33s" with the correct wheel offset, lift and ucas and a little know how. I aND many others are testament to this.
I cleared 33s easily running a Dobinsons MRR lift, no sway bar, ICON UCAS and a caster adjustment as far forward as possible. (Usually 4 to 5 degrees forward).
Nothing else required. 34s are when it becomes required.