The plants still stretch a lot in this week (way harder than i was thinking) i think it has something to do with the cocos and also the temperature was a bit to high this week.
The temperature gives also a bit of stress to the plants wich you can see at their leave tips.
If the grow stops next week i'm gonna fill the pots out to get an even canopy.
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!