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Please take this suggestion with the understanding that I am not a professional A/C repair technician - I only passed the 609 test which essentially means nothing except I know how to blow holes in the ozone.
That being said, based on my review of information I have seen on the internet and not much else, I believe your high side pressure is way too low. R-134a works with a higher high pressure than R-12. Accordingly, I suspect that you do not have enough of a charge. To fully understand your reading we will need to see your ambient tempurature take immediately in front of your condenser.
If someone more knowledgeable corrects me I will edit my posting and delete the incorrect information - so don't quote it. I can't edit something you have quoted in your posting.
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