Can someone look at the most recent photos and tel...

That the plant stopped it's vertical growth means that it will focus it's energy and resources into producing buds. It's hard to tell if the plant is doing anything, but if you take pictures every 5 days you will notice how it developed it's buds. Your temperatures are fine, why would you want to use a heating mat? That could give you root problems. You recently transplante the plants and most likely disturbed the roots giving it some transplant shock, in a few days it will start growing. Be patient and good luck.