When you are talking about a certain unit in a state that the tags are hard to draw you are asking questions to a very limited resource.
I would suggest that you are going to have to get out there and scout the unit and find the water sources for the elk for a start. If you are from out of state then I would suggest that you give the regional game and fish office a call and talk to the biologist for that area and see if he can give you a hand on where to go.
There can be too much of a good thing with antler rattling.
I like to hit the horns together for a good 30- to 40-second rattling sequence and then hang them up and resist the urge to hit them again.
This works to the hunter's advantage, because if a buck has heard it, he may have been 300 or 400 yards away and he comes in and he's not exactly sure where it came from.
When finally is time to rattle again throw a slight change-up into the routine.
The second time, don't rattle as loud...