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Just a suggestion.
Buy good equipment (gauges, pump, sniffers etc) no matter what it costs.
Evacuate at an ambient of 75F or warmer and for 3 hours.
Try to charge at an ambient of 80F or warmer, and adjust the charge amount based on pressures and temperatures.
Keep more accurate records of the procedure and results, such as ambient temps, pressures and refrigerant amounts down to the ounce.
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