The android:required attribute does not serve as mandatory attribute, see <uses-feature> for more info. So this could not be the cause for the app not being listed for certain device. Rather to make sure your app targets all tablets, be sure to remove the following from the Android permissions:
which imply that the target device is a phone.
Do you enjoy Icenium? Vote for it as your favorite new product here (use short code H048S).
Looking for tips & tricks directly from the Icenium team? Check out our blog!
Share feedback and vote for features on our Feedback Portal.