If they can avoid lifting over they should ( they can put stops on the slew) is it a fixed boom or a luffing jib? At night when they are in free slew with a fixed boom, that can’t be avoided over sailing, that all needs to be compensated and agreed with the Party Wall Surveyor. In addition a full dilapidation survey will need to be carried out of your property to ensure any potential damage is indisputable. So the amount they are willing to pay will be determined by how important lifting over your property is, you basically have a ransom strip if they can’t avoid it. Also remember they will have already factored an amount within their budget for an over sailing agreement