It has a long swingarm and a longer chain. Even properly adjusted it looks like too much slack when compared to my previous bikes. Follow the manual's instructions and you will be fine.
50 mm, eh? How many stones is that?I think the 50mm of play noted on the ATAS swing arm is the tightest you want to go. That's a different number than the standard bikes for sure. Too much is way better than too little as the ATAS can for sure have the same issue as the older bikes if overtightened.