I have never bowhunted these units, however, I may hunt unit 74 this year if I can swing it. I have no experience in this unit, but I was told the Hermosa Creek drainage is a good bet.
An article in last years Rocky Mountain Game and fish has an article about Over the counter bowhunts for elk in Colorado, and lists the areas to the north, northeast, and northwest of Durango as excellent areas for elk, although the article was not specific on units.