I also agree we need more size at forward (so long as the player brings offense too).
We didn't only get pushed around v Vegas, we stopped scoring vs Edmonton as they won the battle in the neutral zone and didn't allow Dallas to get near the slot for high danger chances. Edmonton carried a bigger defense (despite their average skill) and it stopped Dallas.
Our match winning players are Wyatt, stakoven, hintz, jrob, duchene...none of them play heavy to breakdown physical matchups.
I'm not saying this is my list, but I think players like Brady Tkachuk, Josh Anderson (that likeness) would be an important fit to physically last the extra rounds we are falling short at.