Dont play Hoffman with Caufield and Suzuki on the PP. Give him to KK on the other unit. That way, you can keep Suzuki on the right circle cross icing passes to Caufield and the same with KK to Hoffman on the other unit.

Put Gally in front of the net and Toffoli bumper with Suzuki and Caufield (with either Romanov or Norlinder on the blue line). Drouin behind the goal line and Poehling or Anderson bumper/front of the net with the other unit.

I would also swap Toffoli with Drouin at 5 on 5 cause Toffoli slows that line down a bit and Drouin would be able to not only keep up but also provide controled zone entries.

I don't often see Gallagher on the 4th, but I think 3rd line is the right place for him. He's one of our best forwards for turning defensive zone starts into offensive zone entries.
We could either use Anderson across from him to send up the ice or dump and chase with speed, or Toffoli for a more methodic approach.
While Evans works as 3C, it's probably better to start Poehling there. Evans is more reliable in our own end.

That also allows us to break up the 3rd line to get those players extra shifts.
Caufield will likely need some time to build up his stamina for the NHL pace, and Gallagher or Toffoli can spot him for a few shifts to keep him from getting gassed.
Evans can similarly take a few shifts from Poehling.
So you'll end up with Evans, Armia, and either Gallagher, Toffoli, or Anderson for a few shifts each game.

IMO Lines should be
Toffoli - Suzuki - Caufield
Hoffman - KK - Anderson
Drouin - Poehling - Gallagher
Lehkonen - Evans - Armia

Could easily swap Gally and Anderson but I like Andersons Size with KK and Hoffman, but gally plays better defense and thats why i like him with poehling and drouin