Don't even think about changing the Hayes line right now... half the reason why grabner is here is to be the burner next to Hayes. Hayes and miller have good chemistry too.
If you want to move people around it's switching up the stepan line, I'd consider doing a shut down line of Nash-stepan-fast. Play them against the other teams top line every night.
That leaves us with
Kreider-zibanejad-buchnevich
Vesey-pirri-zucc.
You seem lost, but I will guide you back.
Why on earth do u want a 4th line player like Grabner on the Hayes line?
Vesey - Stepan - Nash = snail line no speed.
Zuci has speed on the 1st line with Stepan & Nash
Kreider has speed 2nd line with Zib & Buch
Miller has speed 3rd line with Hayes & Vesey
Grabner has speed on 4th line with Pirri & Fast.
Why adjust lines now? Because the last two games was not smooth at all, we struggled for quite some time.
AV will change the lines eventually for sure, because he is like that for years now if you know the history of this coach.
AV seldom adjust lines unless his team is behind in goals, but I rather have the speed on all 4 lines with AV system and tactic, or get a new coach.