I mentioned this somewhere else. A long time close friend of mine who has been involved with archery and related equipment for over 50 years had lunch last year with a " very" well know icon in the archery world and this person adamantly stated that " especially" on larger game, a mechanical is not a good choice. One of the biggest concerns is that if the animal is quartering a bit too much, the mechanicals tend to " flip" out before cutting the hide. I can see where this could defintely be a legit concern.
I have never stuck an elk, but I have always used cut on impact heads for deer. I am currently using the Steelforce blades. Tough as nails and the serated edge can do some serious tissue damge.