Upgraded the machines to 50% more and the amounts are correct. Problem now is with the fuel levels. I can make 60 boards at a time but currently my fuel level is 54 which means I can not add fuel. So the 60 isn't possible every time.
An interesting work around that might take awhile to make is this - fuel tablets !
They would only take half the ingredients and only be worth half the fuel but would be able to allow us to add smaller amounts.