I don't have the hybrid but I have both species. They are quite similar and I doubt there is any significant difference. F. magellanica is a polymorphic species that extends from just south of the Atacama desert all the way to the Straights of Magellan, east to the Agentine Andes.

Fuchsia campos-portoi is from the mountains (in some parts of the world they would be called "hills") of southern Brazil. It looks like a finer-leaved, smaller flowered version of F. magellanica. There are F. magellanicas from mountains or high latitudes that look similar.

The hybrid's main claim to fame is that it is resistent to gall mites.

F. campos-portoi is supposed to be more heat-resistent than most Fuchsias, but I am not convinced that it is heat per se that kills them. You can grow them in the shade, in the Sacramento Valley of California, and give them water, and they'll survive. Not particularly well-adapted but they'll survive. I think that in the southeast it is the combination of heat stress and Phytophthora that does them in.

You might try a couple things. I am sure the hybrid is quite tough given its parentage. You might try giving it something called "root shield"--Trichoderma spores to be precise. Proactively, BEFORE it wilts.

I suggest some shade, particularly in the afternoon. A few hours of morning sun, or just bright open-to-the-sky shade, without direct sun, would be good.

You might try mulching to keep the roots cool and keep the spores down.

Good luck.

Thanks for the advice, atash. I'll look for root shield.