Congrats on the 180. It feels soo good when you can do those whenever you want riding down. First you should practice riding switch until you can comfortably link turns at a good speed. Do that first. Then do the 180 and you just really have to commit. Let's say you land on the heeledge or land flat and go heelside, you really have to commit to switching to toe edge. Once you do that it's mission accomplished. Start slow and low(if that is comfo for you) and work your way up.
