It's time to break the line-up IMO.
Tatar had a strong game, and Gally too, but really, what did Danault contribute on that line ? There was the low-percantage play Danault made that resulted in a goal, but I've seen very little from him aside from that. There would be some benefit from breaking that line up.
Hudon needs to be out of the line-up, too, or on the fourth line, IDC.
Peca isn't doing squat, Dlo sucks, Armia is leeching off Kotkaniemi, Lekhonen is doing great though.
I'd keep
Tatar-Domi-Drouin
Lekhonen-Kotkaniemi-Gallagher
Byron-Danault-Armia
Hudon/Dlo-Peca-Shaw
Drouin has been good in his career at RW, maybe there's something there.... Can't be worse. Tatar and Domi could make some real damage together, kinda like Gally/Tatar are doing ATM.
Kotkaniemi gets his shooter, Kotkaniemi loves to handle the puck and Gallagher is our best one-time player, aside from Kotkaniemi himself, which might result in more goals. Lekhonen is an absolute force on the forcecheck and is disrupting around the net, that's going to create space for Kotkaniemi to do his thing and for Gallagher to get in position for the goals.
Danault is great on the cycle, Armia is great on the cycle, Byron is quick off the rush and he's a PITA around the net, kinda like Lekhonen, plus he's not bad on the cycle, his speed allows him to get where he needs to be quickly before he needs to engage too much physically, all three players are good defensively and can take tougher matchups.
The fourth line is just fodder and shouldn't play more than ten minutes a game, especially not the LW combo of Hudon or Dlo.
The LW of the first and 2nd line could be swapped, Lekhonen would fit in great on any of these lines, and Domi would benefit from being with him for sure, Tatar would benefit from being with Kotkaniemi, too. But knowing that Lekh/Kotka play well together, I'd keep them together. Drouin and Kotkaniemi need to stay away from each other as they both like to carry the puck and they both serve similar purpose on their line (Passer, shooter whenever they don't have the puck.) (Kotkaniemi does it better, imo.)
The PP should also be revised.
Domi, Tatar, Drouin, Kotkaniemi, Gallagher and Petry are the players I'd use, no one else. This makes it six though.
Tatar would seem like the odd man out of the first wave IMO, and the Armia joke has to stop.
I think that a formation of Gallagher as a net presence, Kotkaniemi as the halfwall shooter/passer, Drouin as the PPQB, Petry as the left wall shooter and Domi as the high slot passer or behind the line passer would be great. Kotkaniemi can also double as a slot shooter/presence with his release, one timer and size.
Gally
Petry Kotkaniemi Domi
Drouin
With Domi moving down or up, depending on the situation.
Cmon Clod, be smart for once.