There is no proof that it is 'the same pilot'. If it is a large business, as claimed by the OP, then it is almost certain that there would be a number of pilots who would fly whichever helicopter is allocated to them by the company for that flight. Multiple flights of the same helicopter on the one day could easily involve more than one pilot: let's stop the 'blame the pilot' line unless there is some incontrovertible proof.
cs, does your horse paddock finish at the tree line in your pictures? If so then the helicopters would appear to be well clear of your property and this could be much ado about nothing. The different approaches by different pilots in different helicopters, to (probably) different landing pads would not be unusual.
Have you invited the Chief Pilot over to have him watch the approaches? Have you talked to anyone at the helicopter business, rather than just an exchange of emails? That would undoubtedly be far more productive than discussions on a (generally) anonymous internet forum: you have my name and if you want to contact me for a direct Australian input then please feel free to do so.