After pre-season, these would be my lines...
Connor-Scheif-Wheeler
Laine-Little-Perrault (either wing Frosty...)
Copp-Roslo-Ehlers
Dano-Lowry-Tanev (maybe Dano provides a bit of scoring punch?)
Lemieux
Morrissey-Trouba
Morrow-Buff
Kulikov-Myers
Chiarot
Helle-Bross
I would run everyone equally even though guys want big minutes for the first 20-30 games... we really ran out of steam in the playoffs.