RE: hissing broadheads
Don't worry about the hissing sound. Some call it the "Hiss of Death"
Depending on which revision of the head you have, some hiss worse than others.
The Gen 1 heads were the worst of the bunch. The blade vent holes and the trailing edge of the blades were squared off (not tapered) which caused a pretty good hiss when shot.
The Gen 2 heads added a taper to the blade vent holes but the trailing edge of the blade was still squared off. Better sound wise but not perfect
The Gen 3 heads (current model) have a taper on the blade vent holes and on the trailing edge of the blade. These are darn close to silent when you shoot them (at least comparable to other fixed blade heads).
I have shot the Montecs since they were introduced and have never had a shot where the sound of the arrow was the determining factor as to wether or not the shot would have been good (even on skiddish Texas whitetails). The sound your bow makes is more likely to cause the reflex reaction than the .3 seconds of ssssssssssSSSSSSSSSSTHWACK that you get from the arrow.
The Montecs are great heads. Don't discard them as they are more than up to the task of taking the elk you desire.