Hi DGL. You should get on the Slack group #all-perth-crews. We have 180 + members organising downwinders everyday from 2-5pm, leaving on the hour.
Is that a Facebook group?
I made a thread about it, there are instructions on how to use it there as you need an invite.
www.seabreeze.com.au/forums/Kitesurfing/Newbies-Tips-Tricks/How-to-use-the-slack-app