CIS-E Experts in here! Lower chamber pressures too low

[ps2cho]

I am completely out of ideas on this...

Problem:
During acceleration, it almost stalls unless I go easy on the gas. At speed, no issues.

Lower chamber fuel pressure is not to spec (sometimes), not always. Will go back to 4.9 Bar sometimes.


Tests done:
Upper chamber fuel pressure: 5.4 Bar
Lower chamber fuel pressure: 4.6 Bar <--- too low!! Sometimes will go back up to 4.9 bar. Its random, I can't tell why. - Swapped the EHA with a spare one...SAME PROBLEM, so I can probably rule the EHA out.
EHA current fluctuates (-)3.6mA to (-) 2.2mA. Ignition On/Engine Off: (+)20mA.
Duty cycle is 50% fluctuating

Fuel Volume test out pressure regulator: ~1.5L/40sec.
Coolant Temperature Sensor checks out: 1.4k Ohms at 36C ambient. 290 ohms at Operating temperature.
Potentiometer reads: 7v +0.1v.

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I'm stuck here...What could be the issue here that is causing the lower chamber pressures to be whacky?