I had the same issue when I charged my 260E. It would not pull in anything more than the first can. In the end, I had to run the car at 2000rpm with the can in hot water for it do it. Have you tried that?

I am not sure why your low side is higher than the high side though. Possible blockage at expansion valve?

Did you put in correct amount of oil to correct for replacement of RD? (not your cause, but side Q)

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k