You did not say how far out. If you did not adjust these valves that were not perfect the next day, you may have not been on the heel of the cam when you adjusted that particular valve.
The third wrench is for convenience, the valve is adjusted right or not.
Although you would like each one perfect, it's not the most critical thing in the world. If they were off by .001 or so on the exhausts and maybe a little closer on intakes, I wouldn't lose any sleep over it. Check them in 10 or 15k miles if you want to feel better about it.
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in