While I agree that there has been poor cohesion on the PP (OEL has not looked good), swapping Stepan out would help fix that IMO. I don't think there's ever been a time where I thought Keller and Stepan had chemistry together. It seems like they've been on the same line a lot over the last year and it's never really worked. I don't know what he contributes to the PP either, he's very avg offensively, avg at FOs. Dvorak has 67% at faceoffs to start this year and is a more creative player. Give him a shot on the first unit. He's had some good moments with Schmaltz this year and Keller last.
I'd try,
Keller-Dvorak-Kessel
Schmaltz-OEL
If we're against a heavier team go with
Crouse-Dvorak-Kessel
Keller-OEL
Swap Kessel and Keller if that works better, I think Phil may have played a "D" spot on the Pens PP....
Crouse would be our version of Hornqvist on the PP. Presence in front of the net and wouldn't let anyone, particularly Keller, get bullied on the boards. Losing battles in the O zone and turning it over has been a problem...