There is a pretty big divide in styles in SA.

If you go to Boggy Lake, Stansbury or Murray mouth youll find plenty of guys into Slalom & speed, using big multi cam race sails on slalom boards going very quick!
most of these guys steer clear of the unprotected spots and focus on finding the flattest water to post the best GPS speeds.

As you've found at the coastal spots, even the metro ones without waves, Slalom doesnt exist. There is heaps of people out, but barely anyone uses a sail above 5.7 or a board over 95L. its all freewave + wave & the guys chase ramps at the windiest part of the day. I guess the chop is just too much for slalom, even on the calmer days

So that leaves a pretty big gap between the camps. There is a few freeriders at Seacliff sometimes but not many. I guess its a skill thing too. The coastal guys focus on waves & jumping/looping , the speed guys want be going 40 knots. So generally everyone sticks to their suitable gear and suitable spots and chooses not to cross over.

Semaphore is good for flat water. I need to introduce you to Clive. Or Lake Gorge is u want to break a speed sailing records...

jn1 said..
For speed, join the Bogan speed team on GPS Team Challenge. Popular flat water spots are: Stansbury, Lake George, Murray Mouth (Sugars), North Haven on a northerly. www.gpsteamchallenge.com.au.

You forgot Boggy Lake jn1 , that is where most of the Bogan's sail ( even though it is not your favorite spot ) Wind is always 5 - 10 knots stronger than the forecast in summer due to the sea breeze effect.

Thanks. I will study all these spots to be ready for next time. What are the good conditions for Murray Mouth and Boggy Lake (the closest spots of your list)?
I created an account on gpsteamchallenge but I cannot find it or activate it without any team...

I am now really impatient to test Murray Mouth. Only 2 weeks before having my gear at home...

That's a good point. I went down there a while ago to check it out. Tide was low or lowish, and i could clearly see wooden posts and rocks in the water. I don't know if it would even be safe to sail through these areas on high tide. I could see these things on the carpark side of the strip of water that's sailed on. I don't know exactly where the slalom guys sail down there and on what tide, but it would be a good idea to find out first. i also remember one of them saying something about there being obstacles in the water.