Exactly this. Early in the game I noted a Storm player twisting one of our players around while he had his arm around his neck. At the time I thought it was dangerous but wasn't sure if it could be penalised. Lo and behold, later in the half we get pinged and reported for doing the same thing but, in my opinion, less aggressive. It's these sorts of things that piss me off in the current game.
Additionally, I've noticed that, not just in Dragons games, penalties don't start getting called consistently until the attacking team is within the 6 again range. So a defending team can perform a discrepancy once or twice outside the 40 meters, but once it hits that 40 meter point the 6 agains come thick and fast. It's almost like the refs are being lazy or it's easier to apply/hide the decision through repeat 6 agains. It needs to be looked at.