FWIW, I just sent mine through the TX inspection a couple of weeks ago, and it passed with no problem - wasn't even close. So if you're scared to enrich, don't be. I don't think 1/4 turn or even 1/2 turn will cause any problems.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280