Your system is designed to give you good directions, like a GPS. Sometimes, though, your freedom lies in turning it off, and just explore...
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Group items on your to-do list by the context needed for its execution (where do you have to be, with whom, in what mental state, ...).
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To-do lists shouldn't only serve your "have-to's". Make sure you include some FUN and EXCITING stuff there!
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Your system will definitely tend to chaos. Choose a specific day of your week where you spend some time (1 to 2h) refreshing it. Try not to get lost in execution. The aim is to restore some navigability and sense of control.
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The bad news is your garage tends to chaos. The good news is that's more psychological than you might think.
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Separating Action Points from potentially useful information is a major conceptual distinction of any efficient system. Apply it to your Notebook. Highlight Action points - specific actions to be done - that stand out in the middle of all info (make up a special symbol, or use a color if you like).
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