Pantaloons completely forgot, sorry.
Ill try to do it tonight this time, I put it in my google calendar lol
There was a post about this issue too, its how I found my solution. I am trying to find the post again with no luck.
The general idea was, set your canvas and layer size the same, background goes bigger then layer, set scale to scale, retina display iphone only, then go to your layer settings and set parralax to 0,0
Try that, ill have the exact steps tonight (hopefully)