I haven't hunted elk, but I've read a lot. You have plenty of horsepower with your bow. I'd also go with a 2-blade, cut on contact, and maybe a little heavier arrow. I believe with the right shot placement, what you have now will be just fine, but a little insurance doesn't hurt.

No offense to the guy who gave you the faulty information, but "experts" in this sport are a dime a dozen. KE isn't nearly as important as momentum, especially on large, thick-skinned, heavy boned animals. A broomstraw arrow will show you lots of KE, but it will not maintain that energy (momentum) as far, and it will loose it much faster on impact, vs a heavier arrow. I know a lady that killed a record book gemsbok (about elk-sized) pulling 47@26 on her longbow. She didn't get a pass-through, but the broadhead did get full penetration and stuck out the far side. She shot heavy arrows and a SHARP cut-on-contact head.

Look around and talk to people who have actually killed elk with a trad bow. Read about Fred Bear's elephant. Throw KE out the window--bows don't understand physics anyhow.

Chad