I'm not a STH so I will have to go through the main entrances with the rest of the rabble. Which one is my best bet for minimal security hassles? I don't want them throwing out my chapstick 
The screening is very inconstent so it's hard to predict. But they didn't make make anybody empty their pockets so just put the chapstick in there. They were uptight about bags and liquids, I can tell you that. Just be patient and you'll be fine.
If I had to guess the best gate not to be hassled, I would actually go to the one with the longest lines. It's counterintuitive,I know, but if there's a long line they feel pressured to not be so thorough. That's my two cents anyway...
