I am going to summarize the original thread as its very long and hopefully I will be able to get responses now with everything summed up.

The misfire is random and inconsistent. We have pulled each spark plug out separately and the car misfires harder, but the same amount with each removed, so concluding the injectors/spark plugs/distributor are ok correct?

Firstly, compression rates:
Parts replaced/steps done so far

• OVP
• Coolant Temperature Sensor (checked and ECU adjusted accordingly)
• Voltage Regulator
• Injector's+Seals (previous owner)
• New Fuses
• Non-Resistor OEM Bosch H9DCO's
• New Bosch Ignition Wires (Misfires were now not as strong, but still present)
• Distributor+Cap
• Fuel Filter
• Valve Stem Seals
• Breather Hoses
• Fuel Distributor
• Ignition Coil
• Fuel Pressure Regulator
• O2 sensor
• EHA Valve
• --Checked for Vacuum Leaks (also by 3 Indy's)
  -----
• I have taken the car to three separate Mercedes Indy's in California and none of them could tell me what was wrong so far.

Exhaust smells normal. I sprayed WD-40 around the injector's to test for leaks, but there was no change in engine speed.

We have set the duty cycle to 50/50, 30/70, 70/30 and it didn't make any difference so we have it 50/50 right now.

What's next to test for?

Here's the condition of the engine:

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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