how about trying bergeron with donato and heinen

Maybe. I don’t think it’s smart to break up Marchand and Bergeron if you can help it, or for that matter, break up Donato-JFK-Heinen.

Those 3 are good together but they will get split up. Donato or Heinen will jump up if they split up that top line. I'm thinking Marchand - Bergeron - Heinen and Debrusk - Krejci - Pasta

I think Cave fits better with JFK and Heinen. Donato to line 1RW Pasta line 2RW.

Donato's played with Bergeron and Marchand before and he looks to be playing better of late. Why not try it again?
Krejci with Pasta is good, but if you put Cave on his line it'll still limit him. Cave's not going to produce a lot of offense. Put him on line 3 with JFK and Heinen and they'll win some battles and keep the puck out of the net. The first 2 lines will handle the heavy lifting.