I'm with Boyd...sit tight.  And as Robodad suggested this should give you a good indication of their direction of travel, so you could try moving your stand "upstream" so-to-speak.  Sounds like you are set up in their actual preferred feed area.  You may lose shooting light but you'll be seeing deer sooner too, so it's a wash and you will be hunting deer that are less spooky if they are on established trails inside security cover.  A simply bleat with your voice should stop them calmly for a shot.