You have done a great job on component replacement and your pressures look "by the book". When you say "hotwire" the clutch, did you apply voltage directly to it? or short the leads to the pressure switch (I'm assuming this is what you did)? If you shorted the leads and got 33F at the evaporator, you can pretty much rule out the ETR and some of the other management electrics as the cause and I am then highly suspicious of the switch at the R/D .

What RPM are your pressures being read?

When you increase the RPMs (from idle while watching the gauges) and the low side pressure starts to decrease, does this corelate to the clutch disengaging? How low does the low side go when you rev it a bit?

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)