Are you getting problems under the shade cloth?
I thought if chillies couldn't handle 34-36C, no point trying to grow them in Perth.
My chinenses and the younger potted ones are under shade from a tree and in buckets, but theres about 4 jalapenos, 4 bell capsicums, 2 Hungarian blacks and 2 Hungarian hot wax that are under full sun all day in the ground, plus a bunch of younger seedlings.
Full sun, yeah that wilt every day, but all are podding, and they are only 2 months old. Not wilting in that photo because it's 5pm when it was taken, and the yard is shaded by then. I'm come home after working in the sun on roofs or in ceiling spaces fixing a/cs and yell at them to toughen up, then they drop their "poor me' wilting act and knows who's boss.
Some weak seedlings died, but even some that are unhealthy and yellow and were lost causes are adapting and toughening up, only lost 4 out of about 16. So only the extra weak had died
Of course it's only going to get hotter and I have other plants in a more shaded area, those were just an experiment since I though the heat was coming later this year (it was 24C and raining a couple of weeks ago!)
Ground cover hab. 30cm x 30cm wide, but only 20cm high, if that!
Star survivors in buckets under shade, get about 2.5Hrs direct sunlight in the morning, and the same in late afternoon. Not big growers because of that, and wilt very quickly any longer in the sun so far...
Still haven't watered them for 3 weeks now! (edit, the ones in the buckets and in shade, the ones in the sun all day and in the ground get watered every 3rd day). As you can tell, I've stopped coddling them and told them to work it out themselves mostly LOL. If they can't survive a few days of mid 30C temps, they don't have much of a future in Perth