If you can bring your temps down to 80ish and your humidity up to 40% or so they will be much happier. I'd leave them in those pots another week, then up-pot them and let them go another two - three weeks in veg before switching to flower. They won't be root bound at that size. They spent the last two weeks developing their roots. They do well getting a little root bound - it forces them to focus development above ground. Transplant them too soon and the roots keep growing at the expense of canopy. Wait until you see a little growth spurt above ground. That said, you can transplant them now without any real harm. You can also flower them any time you like. Just realize that they will be more developed if you leave them a bit longer. You have a strong light and good space. Let them develop a bit.