Turn off the heat completely. 78 is warmer than I incubate (I aim for ~75). If the room is comfortable for you to be in then it's fine for the jars, too.
And I can't tell from the description if the tote with the heater in it is sealed off from the tote with the jars, which it definitely should be since there's no point in humidifying the air around a colonizing jar.
The middle jar has the fuzzy, low-density type of mycelium associated with mold rather than the dense and thickly stranded, ropey/rhizomorphic mycelium of cubensis. After doing lots of BRF jars it's one of the many "I know it when I see it" signs of trouble that can be tricky to describe but stands out as obvious to experienced eyes. Many (but not all) molds kind of look like mycelium photographed out of focus while strong, healthy cubensis mycelium looks has a lot distinct, focused lines.
A bad odor is mostly associated with bacterial contamination so the absence of any odor doesn't mean they're not contaminated, it just helps eliminate some possibilities (or confirm them).
Sometimes condensation means contamination, but not always. It's a function of warm humid air meeting a cool surface so it just means the inside of the jar is warmer than the outside. That's usually the case as it gets close to full colonization since the mycelium generates its own heat (which is another reason to incubate cooler than seems ideal; 75 degrees in the room means closer to 80 in a jar). But if it's forming even while heating the jars from the outside then it means it's still even hotter on the inside, though it could also form as a result of taking them out of the incubator into a cooler space (like to take pictures of them).
