The manual is a mess, I tried early on to get stuff straightened out, even identified inconsistencies page by page photo by photo before a printed manual existed. They published it with mistakes and didn't revise it

you need the squiggle down to get the position of the wheel to fit properly, we verified that about 11 months ago. My STI arms give you a little more space as they were designed to increase caster

As Chris indicated a spacer will help to keep the inside edge off the aluminum too