It seems that when I'm printing, the program will put the supports on MOST overhangs, but not all of them. Sometimes it will not put supports on overhangs that are worse than others, but then put it on overhangs that aren't as bad.
Perhaps your pillar resolution is too large? This video did a good job explaining why that matters. If you aren't using an appropriate size, some tiny features may get missed. https://www.youtube.com/watch?v=6tlrCpwAV4M