I hear what your saying and I have come across some of the same things since they implemented the Archery/youth season Sept 1-9th,would be up scouting and seeing lots of bucks, show up on the Sept 9th and hunt for a few days and not a deer in sight,but have found several arrows arrows in the area I hunt in the last 5 years,
I have had to try a few different areas and move a little further off the beaten path as there was more pressure than I thought due to the earlier openings-not sure if this is the case in your area.
Also I have found the area we hunt mule deer in the Alpine in early Sept are gone by the first part of October or when there is any amount of snow in late Sept,October seems to be a transitional month and is hard to pin them down depending on how far the deer have to migrate for rut and wintering grounds ,other areas of Alpine I have found bucks right into November/Decemeber so go figure,sometimes just no ryme or reason to their process.
Depends on the amount of snow and feed I'm guessing and if they have does within a reasonable distance.Maybe Dana could add to this as to why ?
Also key in on the rut as it can be very productive.
Don't get discouraged,just try some more Alpine as there is piles of it in BC