aiming points on diff models of iPads ?

in order to maximize my flinging time I have two different iPads in the places where I spend most of my idle time. the iPads are different models, one is an iPad Air and the other one is an iPad 2. it seems as if the aiming points I use on the iPad air don't match up exactly with the ipad 2. do I need glasses or have these iPads joined in with the pigs to conspire against me?
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