I won't get into the 2,3,4 blade thing but elk bleed like any other animal.Bears have long hair and a lot of fat so often,their blood may not hit the ground.
The other thing to consider is,in the West,unlike where you are,the soil,normally is more loamy and it is much easier to track,especially large animals running.
I would say,just use your best judgement on which broadhead to use and concentrate on getting it scary sharp.If you aren't perfectly sure that it is,get back here and get help till you have it and of course,like in hunting all game,practice and focus on putting that arrow in the pocket.It is just that simple.Part of that concept of "putting it in the pocket" is keeping your cool enough to pick a spot and hopefully you have practiced enough that form falls together,even when your brain is partially scrambled.
It is just like when you hunt bears,make sure you hit BOTH lungs.Good luck.