Ghost is absolutely not struggling on the PP. That is a ridiculous takeaway.
The powerplay, is however, struggling over the last 6 or so games. Sure, that's not good but it won't last like that for long. There is simply too much talent there to bother worrying at all. It has both the very best power play playmaker to go along with the very best net front player in the league. Not to mention, Ghost at the top is forsure one of the best QBs. His shot to me hasn't been as dangerous this year at both PP and ES forsure, and part of that is forsure due to the fact that penalty kills around the league have him and G as their top priorities.
If I were going to change the powerplay up to give it some spark though, it would not be at the cost of demoting Ghost to promote Provy. I would have Provy QB at the top, making passes and threading wristers down low. Voracek is the biggest source of giveaways/flubbed plays of the perimeter guys but still possesses size, quickness and hands. He would slot into Schenn's spot, sending Schenn off the unit. Ghost is our best shooter bar none and would do incredible damage across from Giroux. If teams wanted to cheat on that and leave Provy more space, I have no doubt that he would show no problems with taking advantage.