Thats a big difference since the switch to 12/12 isn't it?
I didn't knew they gonna stretch this much, i think they get way to long if they don't stop growing this fast...
My humidity was also way to high so i lollipopped all the plants and removed some of the bigger leaves to get some better air flow.
Lets see what next week will bring ๐๐ป
Not an expert but from knowledge gathered here tells me the big diff between your day and night temp are what might be causing the stretch!
Otherwise she looks healthy and happy. Happy growing!