Nobody has mentioned airflow across the condenser at any point in this discussion. At 2000 RPM without the car moving, the pressures will be elevated due to lack of airflow across the condenser. For any meaningful measurement, you should have a fairly strong fan blowing across the condenser when doing your measuring. At 105˚F, the pressures are going to be high anyway. They'll be higher than when the car is moving, even with a strong fan blowing across the condenser.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]