Do dark conscious thoughts go to the deep subconscious at the same time they are deposited in the thought plane? In other words, is the deep subconscious always listening to our conscious thoughts?

This is quite correct. After all, it is the number one job of the subconscious to keep the person alive. It needs to know what's happening, it needs to know what the person as a whole is doing, because survival is at stake, so will be very keenly observing every awareness and thought that comes along. In a sense, it has an intuitive impression of everything in the environment, as well as the emotional potential in the impressions coming in, and the information from the sensory organs—all are processed and will have the potential to generate an emotional response that corresponds. This as well, is a function of the subconscious mind, to enrich the experience of the senses with a bodily response. This it does through the emotions, and so there is a constant interplay and vigilance to be on top of everything that happens. This is automatic and guaranteed.