Think your day time temp is higher than 20 and 60 humid too high for this stage of flower , brownish pistils shows me that, all other is a dream, nice one !
Hey my friend, you should move the fan closer to your Royal Gorilla and raise the pot if you can, it will strengthen and eventually stand up on its own! Limit it with a root juice or a bit of easy-to-find and cheap nettle manure. It's full of nitrogen to give it the strength to stand up.