I am not familiar with the area you are hunting, I have only driven thru area once in my life, in 2013 on the way home from Alaska. I would concentrate on agricultural land areas myself, parks in the forest, Mulies may bed down in denser brush during the day, but usually come out in the evening to more open areas, usually you can get up above these areas and do glassing, a lot of glassing, locate animals, then attempt to get closer. I would put the grunt calls and bleat calls away. Ignore the sales man on the outdoor stations. Lastly, talk to a wildlife biologist up in BC who works in the area, I am sure there is one working for the province somewhere close to you.