As said earlier, always err on the side of slack rather than tight.
Personally I reckon anything under 30mm is too tight, do the recommended trick of checking with someone sitting oin the bike and you'll find the chain gets quite a bit tighter.
I'd guess the most likely cause for the endplate to be loose is that you adjusted them with the wheel-spindle completely loose, then tightened the spindle and it shifted slightly. I usually have the wheel-spindle just ever so slightly nipped while adjusting the chain, the adjusters then pull against a slight resistance and usually don't move.
The wheel spindle isn't all that tight, 100Nm isn't a huge amount (pointy, 65Nm curvy IIRC). In context, if you weigh around 70-80kg, or 11-12stone, then it's equivalent to your weight on the end of a lever barely 150mm or 6" long, alternatively half your weight on 300mm or 1' long.
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