FlytrapCare Carnivorous Plant Forums

How long ago were the planted into those pots?
I ask that because it looks to me that the B52 is way too deep in the moss. The DCXL might be a bit too deep, and I can't really tell with the Alien, the gnat trap is blocking.
You also said that they're inside, which can factor into it, only receiving 3 hours of direct sunlight and 7 hours of artificial light. I'm assuming the sunlight is filtered through a window, which is next to useless for a VFT. Glass filters out most of UV, VFT's love UV. But you didn't specify what kind of artificial lighting you use. I just took a fellow member that lives near me some Sarr seedlings, and he has dozens of VFT's growing in his garage under big led growlights for 12 to 16 hours a day. So yours are likely not getting enough light either.
Last, Flytraps can take heat on top, you just have to try to keep the roots a little cooler. VFT's in the wild regularly see 100°+ temps and do just fine. The difference is their roots are insulated in sandy soil with a high water table. They're not swimming, but the water evaporates from the sand, cooling it a bit. Also, plants growing around them provide shade and more cooling factors for the soil.
Maybe get some shade cloth, at least 50%, and create a space where it blocks direct sun while you acclimate them to outside, don't worry, they'll still get enough sunlight, and try to devise a way to further shade the pots so that solar radiation doesn't heat them up.
Good luck.