Most mini splits have been optimized heavily during the design phase, so getting much more than how they ship will take something aggressive. Your main enemy in this case is the outdoor air temperature. When it gets very hot or cold outside, the ground is a much better source. You have to figure out the way to level this temperature shift that works for your site.
As the outdoor temperature moves away from the indoor and ground temperature, direct heat transfer with the groundwater becomes the best power saving option. Running a radiator to temper the outdoor air will not grab as much heat. However, if you use a low power pump to supply it you might save more watts than by using a well pump.
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