My sister's car seemed to do that one day, the sun was on the driver's side, and pass side was shaded...I retested it later and it was OK. Check your vent thumbwheels. I set mine at sides:full open (white mark up) center just about full open. The cold air originates from the center of the car. 1 pound 10 oz sounds like you are fully charged, there is a sticker under the hood to verify that. My Mystique is well cooled now..
