Thank you. All of my injectors were retested and although the patterns look good and they chirp as desired the pop pressures are below the minimum of 15 atm or 220.4 psi, per the gauge they pop at 200-210 psi. Gauge tested (actually reads a little high) as a precaution and the conclusion is that the injectors all pop below spec...
I have no problem running injectors that open at 200 PSI. As long as they have a good spray pattern and don't leak, they are likely to work just fine.
MB sets a lower limit of 150 PSI compression ( on a 280) before rebuilding an engine even though that same engine will run without issues. When they set those limits, they were not thinking about 50 plus years into the future where parts are now getting harder to source and these cars don't see a whole lot of driving. These guidelines were meant for MB dealers who would benefit from getting their customers to spend money on a currently driven car, not an occasional toy.
Save your coins for things you actually need like fuel, insurance, or tires.