The other aspect is that the compressor is then radiating heat toward that condenser, and often it is in an enclosed space without the proper ventilation (under a bar cabinet, or an enclosed island salad bar, or even a hot kitchen) which will raise the temp and pressure of the refrigerant you discussed.
Further, I have never found a clean condenser, unless I serviced it the day before. So the fan may not be moving enough air to keep the heat from the compressor from raising the pressure of the refrigerant.
There are a lot of factors that are not ideal that affect systems with problems. And, compressors always have refrigerant in the cylinders due to the area at the top where it cannot be forced out. So, it is continuously expanded and compressed with every stroke, making pressure at the output of the compressor while it is running, even when all of the low side volume has been consumed. In order to raise the pressure at that point, you would indeed have to add more refrigerant for it to compress, and that would be the overcharge mentioned by others earlier in this thread.
We would need to know how much of a charge was forced into the condenser, and how hot that charge is due to environment and radiant heat from the compressor shell, in oder to predict the pressure you would find on the high side with a cap tube restriction.
Then there is a restriction in a cap tube that is not 100%...
Shall we continue?