Jon Eros. Your recipe is here. https://satisfactory-calculator.com/en/blueprints/index/details/id/9586/name/100+Smart+Plating+V2

75 pm heavy oil residue turns into Petroleum Coke and it goes to sink. For stabilizing production. My answer to the second question is that even though the first recipe uses less ingredients, I wanted to choose the one that produces more output. I thought it would be better to use less machines.

2 questions, what are you doing with the left over heavy oil residue? your calculation shows it has 75 pm left over,

second question, why not this: (it uses slightly more iron, but it completely eliminates the need for oil)

https://satisfactory-calculator.com/en/planners/production/index/json/%7B%22Desc_SpaceElevatorPart_1_C%22%3A%22100%22%2C%22altRecipes%22%3A%5B%22Recipe_Alternate_Screw_C%22%2C%22Recipe_Alternate_PureIronIngot_C%22%5D%7D