jims,
Try starting at the start...think big-picture.
When archery hunting, and special archery only seasons, were established, success rates for all species were in the single digits.
The reason to allow archery hunting at all was based on the fact that success was so low...low enough that we could allow archers to hunt bull elk during the rut (when they're the most vulnerable).
Very few archery hunters, low success, and very primitive gear didnt have much of an impact. Not to mention that the level of committment to be effective with a bow took months, if not years to master. 20-40 yards was considered maximum range.
Flash forward to 2013...we now have mechanical arrow launching devices that are shooting in excess of 300 FPS, carbon arrows, expandable braodheads, laser rangefinders...the list goes on and on. I can take anyone who is able to pull a bow back, and have them shooting good enough to whack big-game out to 20-30 yards in a matter of hours...or less. With practice, 50-60...even further is no big whoop.
With that increase in technology, success rates, the number of archery hunters, and total impact to the herds has increased 3-4 fold in many cases.
There is NO reason for archery hunters to have a set-aside of tags...they can enter the draw like everyone else and then pay an additional $30 and get the benefit of hunting for another time period (14-30+ days) prior.
If they cant live with that...they can stick in their a$$.
They dont need their own pool of tags.
Theres also a lot of things you arent considering...one being that archery hunting puts additional pressure on elk, and in many cases (like unit 7), the pressure is so high from archery hunters, the elk are pushed onto private much earlier in the season.
This in turn increases harboring issues, decreasing rifle harvest (as archery runs right up to the rifle opener), and keeping elk wayyy over objective.
Its also fair to note, that a vast majority of the annual elk harvest by archery hunters is bulls. You dont control over-objective elk herds by killing bulls...you do it by harvesting cows.
You arent thinking big picture...and statistics arent painting an over-all picture of impacts.