I think perhaps the problem is that the App requesting permission to things that don't exist on Nexus 7 Tab.
This permission in your manifest implicitly declares the "android.hardware.telephony" feature. Nexus 7 Tab support this?
Refer to the document: http://developer.android.com/guide/topics/manifest/uses-feature-element.html#market-feature-filtering
<uses-permission android:name="android.permission.CALL_PHONE" />
Try this, keep the permission, but declare the "telephony" feature as false.
<uses-feature android:name="android.hardware.telephony" android:required="false"></uses-feature>
If it's not work, maybe you should change the "normalScreens" setting or "requiresSmallestWidthDp" setting and try again.
With the Open GL feature below,
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
This setting will exclude the devices not support OpenGL ES 2.0, but the GPU in Nexus 7 is ULP GeForce, which OpenGL ES Version is 2.0 .