Rotary positions eh!
Well all the books and experts say that the rotary should be at the head of the pattern, but that doesn't always work out. I've had it going behind me in a differnt field to help pull birds over the hide. On another day birds will deviate rapidly away from the rotary as soon as they see it - so either bring it in or put it down the far end of the field and maybe the birds will turn towards the hide?
Just experiment and don't keep it in one place if nothing is happening - try it all over (or bring it in)