When you create your circuit shape, using the nodes, go around and carefully delete off any extra bits from corners or straights. Once you've done that , it might be necessary to go over and re-draw a straight, or delete a straight and then draw it back in again. this should then "set" the outline from the thick dark drawing lines to the thinner lines of a fixed shape.
Once it sets to the thinner line, post 2 here should help you with the off setting.
Hope that makes sense and helps.
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