Well I was probably over-eager to judge there (and maybe again now!). Went richer again and problem got worse. Right I thought, I'm sick of this, let's go wild.

So the EHA is now adjusted it hugely CCW (about 3/8 turn) - from what I read this means leaner.
And what do you know, the low down torque is massively improved and I am certain of this. It doesn't have the same throttle lag/delay either but can occasionally mildly hesitate.

Further adjustment required. I can't work out why it's better this way? Perhaps my fuel pressure regulator is actually the problem.

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg