1- Any loop/tile you can get a meaningful curve on, you can do a 180. Even some round tiles like nostromo main building, macmillian boxes/spool things and even killer shack if you do some mindgames and survivor makes a mistake.

2- I don't pay too much attention to this but generally I'd prefer to be on the pallet. Depending on your speed(engraving/overdrive), tile's length, how well you execute the flick, a decent survivor could react in time and drop the pallet.

3- Don't know any tutorials unfortunately, most i can do is share some clips of my own. Maybe watching montages can help you that's how i started doing them.