When you adjust for .7V it needs to be at operating temperature 750 RPM idle without any accessories on.

If you had the WOT / idle switch apart I'd make sure you don't have the leads reversed. Disconnect the 3 pin connector and jump one lead to the center lead. Give it a bit, disconnect it, and connect the other lead to the center lead. One of the two conditions will be correct for idle. If you get a stable idle in one state then make sure the switch correlates.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff