I look at this a bit differently than a lot of posters. Firstly, I think Ehlers should always be used on power play # 1, because he gain gain the zone easily, and is one of the best stick handlers with the puck. This would be key to getting the power play going. I still think Laine is a bit awkward and skaky with the puck. His stickhandling is improving, but he isn't close to Ehlers IMO.
I also think Ehlers would be the most productive of either Laine, or Connor, on the 1st line, but I'm not so sure I'd want him there, because Scheifele can gain the zone and drive the line. I think Ehler's is fine on the 2nd line -- keeps up the speed threat.
I may like to see Wheeler dropped down to the 2nd line, and I'd also like to see him at center, as he did fine at that position when Scheifele was injured -- but Little at the 2 C is also OK with me.
You could put Wheeler on the 2nd line at winger, and see what happens ? I'd shake things up a bit --we're starting to sputter, and are having a hard time scoring -- be nice to see a "spark" and get things going here. ( some scoring)