Hi Steve,
First of all, congratulations on developing such a dedicated practice all on your own! That is a wonderful start, and so difficult for so many people.
I agree with SPD that eventually it is super helpful to have someone to guide your practice, as there are often times when we get into tough situations and someone who knows you and your tendencies can really help work it out. I know the Shambhala centres offer free meditation instructors, I have one and it has helped a lot.
In terms of your practice, I would say that being open to whatever is arising, moment by moment, could help. In my view, it is not the aim of meditation practice to reach a deeper state, but to observe the fluctuations of the mind without judgment. When fuzziness arises, you could become aware of the thoughts about it (talk), the sensations in the body (feel), and any images (images). Breaking it up into its component parts can help bring some ease to the whole situation. Trust that this, too, shall pass, and you don't really need to figure it out.
Another HUGE piece to practice is self-compassion. Developing wisdom without compassion can lead to a whole host of problems. When you are sitting, an attitude of being kind towards yourself, spending the time making friends with yourself, rather than trying to make yourself better in some way can really help. Remember that you already have within you everything that you are seeking.
Much metta,
Paula