Before you start criticizing, notice the age of d-men.
Barron, Hutson and Struble have played less together than each of the Fehérvári, Sandin group. Not to mention Carlson and Van Riemsdyk. Alexeyev would be one of the most experienced defensemen in your team. McIlrath hasn't played a huge amount of games in the NHL, but over 600 in the AHL.
Then the centers, the basic of the line. Washington has Strome, Dubois in TOP 6, you have Suzuki and Newhook. Dvorak is an opponent agent for more than one game. It's appalling what he's showing.
Heineman, who's max a third line player and even that when players are injured, is playing on the first line.
You can criticize the tactics, but it's one thing to criticize the tactical guidelines, it's another thing to see if the players can execute them.
To judge by Columbus, make the fourth line out of tough players who will play extremely hard, good in for checking, fight the opponent. For example, something like:
L. Tuch - F. Xhekaj - Pezzetta
(write your version, you know players better)
It will definitely be better than two amorphous players Armia and especially Dvorak.
By the way, I don't know why you have Matheson. That corn protection in front of the net... .