Each year I have casualties from our brutal sun.. last year was an awesome camellia with a great 3d nebari to die for

This year

I installed it over the weekend.. very happy.
I've got a wisteria that is growing very well and have put it under the shade cloth as a centerpiece for now.
I know they need full sun to encourage great blooms for next year. Would being under a shade cloth impact this.
With east to west sun, being in Vic the sun currently arks right over so it does get constant sun.. just not as strong as full sun though
Any thoughts?