What does the high side do in relation to the low side @ 2000 engine rpm?

Some block type units are adjustable. Since this is a fairly large system (TM31 compressor) It may be.

Adjustable or not, your low side pressures are controlled by the TXV.

Is this a block type TXV with both the liquid & suction line running through it?

Yep.

Plugged TXV as predicted.

Glad you got it fixed.

Where & how is the TXV sensing bulb mounted?

Is the TXV internal or external equalized?

A picture of the TXV install might help

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