Need to Pass SMOG, high idle and advance.

My 90 560SEL failed due to 950 rpm idle and 30 degree advance, but passed the emissions with ease.  Car runs great!  I was directed to the EZL, but I can't prove it is causing the high idle.  I don't have a spare, I'm trying to really find the fault due to the cost of an EZL, $$$.  There's got to be some good techs who can help me sort through this and pin point what's wrong.   I was directed to R16 and that made added a lot of fun to this.
 
I pulled the plug on the idle air valve and the idle shot way up.  Idle does go down to 650 when I pull the vac off the EZL.  It
 
Here's what I found with my EZL:
1) TDC sensor ~800 ohms engine cold (50degrees F, California), ~1050 engine at temp.  Expected, I think resistance in copper wire is heated.  I expect a lot of windings in a magnetic pickup.
 
Below are all at idle in Park:
2) Removing vac drops timing to one of 5 steps set by R16 settings: 5ATDC, 0, 5 BTDC, 10 and 15.  You can get three easily: R16 in (0, 5, or 10 BTDC), R16 shorted (5 ATDC), R16 pulled out (15 BTDC).
3) Applying vac at idle jumps the timing from one of the 5 R16 steps to ~25btdc then in 8 to 10 seconds later it jumps to ~30btdc. 
4) From the R16 step, EZL timing advances smoothly as vac is increased from <~10lb vac down to ~40lb vac. 
5) EZL timing jumps in steps as R16 goes from 0 to ~3k ohms.  (That is the full range of my EZL response to R16 resistance change.)
4) EZL responds in 5 timing jumps of timing to 5 RANGES of resistance:
0 - 145 ohms   ~4atdc
150 - 330        ~0 tdc
350 - 675        ~4btdc
680 - 3.0k     ~10btdc
3.2k - 0pen    ~15btdc 
5) R16 must be available in 4 resistances about 100, 200, 512, 750, (and maybe 3.5k).
Mine measures 750, it is color coded 750 and part# 000 540 24 81  I think Bosch 09 8659 24.  That puts my timing at 10. Shouild it?
 
Now I wonder if the smog tech should have pulled the vac line to expect 0TDC. And my R16 would need to be ~200 ohms do do that.  And, Why hasn't this come up on earlier smogs?