Trigger time is always GOOD! Learn range estimation or carry a range finder. The air is drier out here(in the Rocky Mountains) and it does effect the appearence of the distance to your target. You may get lucky and find your trophy bull at less than 200 yards. However, there is just as much chance at having that once in a life time trophy lookin at you from a quarter to 1/2 mile away! Have the proper rifle and know how to use it. Be prepared to rezero your rifle, out here. (I usually take two rifles, as much for having a spare as well as more flexibility in different terrain) The atmospheric density changes your point of impact, considerably with changes in altitude and humidity!
Know your hold overs or "come ups" for all the distances you are comfortable shooting. Remember, the target is NOT the elk. It is the central nervous system or that organ or bone structure that will eliminate the animals mobility. You can heart shoot an elk and he can still run for a quarter mile. That is never a good thing. A wild animal is far tougher than you are. An elk carries more oxygenated blood than a Himilayan Gurka. Pumped up on adrenalin, they can run, even though their heart is shot to shreds. A double lungshot bleeds 'em out and a spine shot will drop 'em in their tracks!
I would recommend Colorado, but for the hugely complicated and restricted hunt times. We have huge herds of Elk on the Western slope. I have elk right here in our neighborhood. Trouble with that is all the private property and again, the restricted hunt times. By the time you locate the herd, your season is over!!!! Not Good!!!
Your running will help with the lower oxygen at altitude, but work in a pack with weight to get used to carrying a load under physical stress.
I used to back pack in when I was young. Humped out a few elk in my time. Used a Mule in later hunts, but those days are over, for me. I have to hunt them close to home, these days. Good LUCKOo. ! GregH