Okay, here are a few possibilities. First, they do make a High performance freon and carry it at Autoparts stores. Second, moderation. All A/C systems have a low pressure cutoff switch and a high pressure cutoff switch. You want to stay below the high limit. Freon is a gas and will generate more pressure when the outside air is hotter. The switches run $20 to $40 each. It may be possible to change to different pressure numbers without blowing a hose. You old switches could be weak.
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