Beter late than never :)
I was at blackies a couple of days ago and in channel and down at the falt water in salts bay and caves beach today
There was also a group of guys at a flat water spot called salts bay today.

Go to swansea macas and turn left at roundabout towards caves beach
Take the next major left towards swansea heads
Follow ur nose up the road a bit and go left down a dirt road ( I think a sign may say fisheries)
walk towards the rock groin a bit to get out of the wind shadow
There is the odd razor fish (shell) in there if you plan on walking a bit