I not sold on the parallel out and back with the blob on the end, it screams I needed extra length and couldn't think what to do.
I've made a slight adjustment that adds a little distance, and respects more of the classic layout.
I've use where the trees were cut down for the dirt circuit, but if you still want to have one, I've brought it inside the circuit.
This isn't a final suggestion, it would need tweaking for run of, and adjustments for the dirt circuit too, but you get the idea.
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