Replant into a quick draining mix and you'll never worry about overwatering.
Sun might be cooking the root zone. If ambient temps are over 100+ then for sure, the root zone is higher and hotter. Plants shut down and stress. Keep the pots cool. Many plants will start to shut down (summer dormancy) when heat stressed, including Adenium. Ideal temps range: 70-90s * F. Root zone needs to be kept cool.... when plants are potted, and the restricted roots can't grow into the cooler substrate, like they would in a desert.
Stick a bamboo chopstick straight down into the medium and leave it there. Pull it out if you think plants need watering. If the chopstick is damp...the plants don't need watering.
I'm trying to keep Adenium, and other fat-plants alive-ing and thrive-ing, here in NYC-7b.....and myself, too. I wish I had your sunny, warm-hot growing conditions to worry about. My season is now coming to a quick end. Night-temps are sinking to the low 50*F. So all my plants must come into my kitchen at night, and then, back out during the warmer day. It's a huge PITA moving heavy plants in and out, in and out. I need my head examined. But I do it to squeezed every inch out of my short growing season.
As to why your leaves are pointing up....btw the double-flowering Adenium look fine....I would only be speculating.
I'm sure your plants will do just fine. Good luck.
