Goes in everytime, on the third time.
Or in the case of centerpoint arcs, goes the correct way, after you wiggle your mouse around back and forth a minimum of three times.
I clearly didn't want 320 but rather 40 degrees. Is there a method to this madness, one of these little things I should have known about, but just skipped that year's What's New press release?
I got really excited fiddling with this before making this post because I thought I'd actually figured out there was a method. Turns out I was wrong, moving your mouse inwards and in the direction you want does not give you a small angle, and outwards in the direction you want does not give you the big angle. That was just a fluke of the one time I tried it. Sad face.