Just reread your first post. The condition you describe is consistent with chain stretch as both cams need to turn just a bit further to be on the marks. Don't know if it makes a difference, but was the drivers side chain guide pinned in place when you did this? I can't remember if the guide creates a longer chain run. If it does, that would advance both cams slightly thereby bringing you closer to an on spec condition.

J. M. van Swaay

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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles