I would keep my distance and listen, but your side x side will not hurt you that much, turkeys can't tell the difference between noise of a side x side, airplane or helicopter going overhead... What will cause you the most problem is the amount of time and pressure your putting on the birds ... If you go in the morning i would suggest a good hour before flying down, just to let everything settle down. Roosting in the evening just find a good spot to listen from... IMO