I'm in Cape town. Similar climate I think to you. We grow grapes here too.
Long season. We have great sun but lots of heavy winds at times. I like to FIM after 10 nodes and strap everything down super low and of the wind. Not for stealth. Get up to 800g from wine barrels.
Other than that, I grow organic and with really rich soil and mostly just water.
tons of ways to roll a fatty so just got to find what works or you.
Yeild in my humble opinion is better when topped and all the branches are pulled down into a canopy just like indoors but waaaaay bigger.
Good luck with your grow .
I'll leave this for you
will keep an eve. Love me some outdoors sun grown vibes