By you telling us you were going in to your spot so soon I already knew you were moving too much during what I like to call "the magic hours" the first 3 legal shooting hours and the last 3 legal shooting hours.
Coughing could blow a days hunt but then again if the Deer are SO focusd on doe's during a heavy Rut you could almost get away with anything. just like chewing Tobacco, Yes that could bust you too but again if those Bucks are only interested in doe's it may not matter.. again slow movements, try to keep the wind in your face and try to spot them before they spot you...
Good Luck !!!
Democracy is two wolves and a lamb voting on what to have for lunch.
Liberty is a well-armed lamb contesting the outcome of the vote.