Millertime10, I had that exact thought, and when I was about to do it I had remembered that I read somewhere that if you do a call when they are too close they are able to pin-point the location TOO WELL and will know it's come from high up (your tree). Is this not true?
Be careful if you try this. IMO it's best to wait until the deer starts to loose intrest before letting out another call. If he's close and looking for you and you call he'll pinpoint you in an instance. If you wait until he starts off again and he's not looking at you you'll have a butter chance of getting him to come in.
Just curious , What type of can were you using? At this time of year an immature buck gunt should be the most effective call for bucks. It's not a lot of help with doe(doe call is best for doe this time of year IMO) though. Personally I like the bow grunter. It's hands free and the call actually points out behind you so it'll be harder for a deer to pin point you.