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An A/C is rated at 95 degrees ambient temp. For every additional 5 degrees that temp goes up, there is an increase draw of 1 more amp. When temps reach 100 degrees or more on the thermometer the actual temp on the A/C may be as high as 125 or 130 due to heat absorption. So that is why you are having an issue here. The lower the input AC voltage, the worse this becomes due to the amperage increasing. You can help offset this by turning off any other things using AC like the fridge and water heater. Turn those on LP mode. Done use any adapters or longer cords. Those decrease the input AC voltage. Shade the A/C if you can to keep the sun off of it and reduce the temps at the unit. Hope that helps here. Please get back to me if you need more as all follow ups are included in our fee.
Just checking back in to see if perhaps you missed my earlier response to your question or if not, do you still need some additional input from me here?