I have a Kali Mist and a black pearl that look identical to yours. They're at week 9 of flower and have been fed twice with tiger bloom. My feeling is that either they've been a bit over fed... how I don't know but other wise it's just how they grow.
The Kali Mist has well overshot the light which is ON THE CEILING. The black pearl has been bent and is about a foot from the light running completely across the grow area. Buds seem to be filling out slowly too. No sign of hermies although they do look a bit stressed so I guess all i can do is water them and continue on.
You have to be careful with these kinds of problems especially in flower because it's real easy to do the wrong thing and screw up everything. Go slow and don't over react is who I see it.