I am hunting the same stand twice a week and noticing fewer deer. Im doing everything to be scent free, but do you think I am overhunting this stand? It is at the only food source on the place and I never had time to scout it out properly.

Unless you are spooking them or leaving scent in the area I don' t think twice a week is bad at all.

Twice a week should not be over hunting a stand. Must be some other factor causing your deer sightings to decrease.