First off B-L-S hasn't had the toughest matchups, that has fallen to LLW, who is also expected to generate offense which they have done. LLW continues to be the work horse of this team in virtually every facet of the game. So as a so called down line B-L-S have actually been slightly sheltered. But the have had their butt handed to them both possession wise and 5-5 GA60, and have produced little offense. Virtually none if you remove Stafford. While B-L-S have had slightly tougher matchups than P-S-E, P-S-E has had far better possession numbers and is producing offensively at a far greater rate. At the 2 ends of the spectrum, Ehlers is 2.80 while Burmi is 0.74 5-5 points/60.
So to get back to our little thought experiment, if your goal was to give Petan a better opportunity to excel you move him up to the 2nd line to play with Scheifele and Ehlers. Matchups aren't tough and he would play with 2 guys that have been pushing possession and filling the net. You drop MP to play with Lowry and Stafford. MP has been the Jets best possession player this season so maybe a little offensive zone time helps this line get on track, and MP and Stafford could at least work with each other to produce offense. You drop Burmi to the 4th and move him to centre. The line still won't produce any offense but you could at least run them 10+ minutes and expect them to play a defensively responsible game.