I confess I am a Panthers fan and want to add a bit of balance to this discussion.
The 1st sin bin was contentious, but it was early enough in the game to give you a chance to recover. During that period the Panthers lost their halfback for HIA and were quite clunky in attack and To'o was on one leg. Furthermore, the try scored by Spencer Leniu was through the middle of your defence and had nothing to do with being stretched with a man down. It was just soft. Kikau scored 10m from the posts. Again, soft, not because you had a man down. You have to own that. The two tries were about mental fatigue, not the loss of a player. Your heads had dropped.
Contrast the second half sinbin. You conceded no points. You were up for it. Fired up, bashing the Panthers and right in the game. If you had that attitude for the first sin-bin, Leniu wouldn't have strolled though like he was out for a scenic walk.
The final penalty count was 6 - 7. The Dragons had possession for 31 minutes versus the Panthers 25 minutes.
The Panthers lost their star winger (he is normally worth 200m a game, the best in the NRL), and their number one prop JFH. It had a massive impact on the Panther's ability to roll down the field.
You didn't lose because of the refs, you made more metres, had more possession and made more offloads. You lost because you have a few rookies and aren't quite there yet with the tough mentality that teams like the Storm have. Last week the Storm lost three players including two to season ending injuries and were already missing a few star players and yet still won the game.
I am sure you will improve as your rookies get more game time and that will also help your mental toughness. You have a good tough pack and I think you will have a good year, good luck guys.