Wow again. Where did you ge the connectors? -9.87? is that ma, just checking...
Big number. says its pretty far off, then you only turned 1/8 and got 3.89? Did you readjust the mix? 3.9 is a lot closer than -9.9 AND the sign change says you went past 0 in 1/8 turn. Sounds way too sensitive. But again, you didn;t say you did the necessay mix adjustment. Then 12 turns???, wow you were supposed to be looking for 0.0ma +-.1 ma. Soundslike you either have a defective EHA or your adjustment technique "needs refinement."

I'll go out and play a little, But I suggest you look up Evaluating Electronic Engine Controls in DYI and search M.B.DOC he replied to you a while back.
Moderator Also My LAST ovp/eha question, I promise!!!! is a long read but several good tests and explanations.