I'd like to see Hoglander reunited with Lafferty. They had some really good chemistry before Hoglander moved up the lineup. They tried that briefly with Petey early in the playoffs, and it didn't work, so I'd put them with Blueger. 4th line has been okay, but getting some production from them would be huge.
That leaves PDG with Petey and Mikheyev. Not ideal, but PDG did have some productive top 6 time way back when.
Or try someone getting called up from Abby. Don't even care who - Raty and Sasson had good playoffs, Podz could get rolling, I dunno.
Lines 1 and 3 are playing well and should be left alone. But do think there's room to tweak lines 2 and 4. Nothing wrong with making some proactive changes because we looked better, but still not firing on all cylinders.