Put your hunters in there and then go look at the blind from where the turkeys where.

Are you back lighted - does your silloette show up?

Is the blind in the shadows? Staying in the shadows helps hide movement.

How far did you place your decoys away from the blind? I place mine 5 to 7 steps from the left side of the blind as I am a right hand shooter.

It might have been the decoys - might want to try placing your decoys or decoy off to the side along brush line and in a place that the bird needs to be real close before they see it.

I have used blinds in many-many different set-ups and I look at all the above. I never brush them in but do use surronding low hanging branches/shadows to help blend my blinds in.

JW