8 MB should not be a problem. However, you can safely drop armeabi-v7a if you verify that it is not performance bottleneck.
Alternatively, you can use the multi-APK approach to make user downloads smaller. The official site recommends: You should generally use multiple APKs to support different device configurations only when your APK is too large (greater than 50MB). You should carefully follow the version code guidelines if you choose this route.