I used to spend a lot of time in the vernon unit, worked out there in the summers I would ride up those canyons endlessly every evening on motorcycles, and we even had a cabin. If you want a really big buck, I would stay away from the Kegs, simpsons and sheeprocks. True there are some big deer out there, but unless the migration is just right the best you will see is a 20 inch buck, which tends to be the normal mature size of the local herd. If you are looking for the monsters I would stay south of vernon, tintic, bennion, harker etc. The east side of government can also be fairly productive. The more west you get the more desert like and the smaller the deer in general. Now if the weather is just right and the migration starts there can be some big boys heading accross the simpsons, but it doesn't happen often during the season.
T