I'd probably go with the 2-blade Simmons because it's the smallest blade and the heaviest arrow.
Though you can kill an elk with that set up, I think it's on the light side. I shoot 6-10# more in a high performance bow (Wish I could shoot more.) and arrows in the 600 plus grain range. And, yes, I have killed a few elk.
Can't say that I've ever zipped an arrow clean through an elk, but usually manage to get the broad head out the far side shooting mid-50s high performance bows, 600 plus grain arrows and 2-blade broad heads.
Get close and be selective and you should be able to get the job done. Good luck.