To me your designs look like the the circuit length needs to be longer to accomodate the tighter bends on the circuit. An example is the last 2 bends before the start finish or the complex after the start finish. You will only get a better idea when it is scaled with a normal track width to see how the corner radii work out. I would agree with SBF on the middle circuit. It could be made shorter into a kart track.
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