I understand that you are having some issues with the SlingPlayer Mobile application on your Android Mobile device, since the video quality is not good enough.
The main issue is that the SlingPlayer Mobile application for Android Mobile devices was designed in order to work with the Slingbox PRO, Slingbox SOLO and Slingbox PRO HD. This information is stated in the website. Your best option is to upgrade your Slingbox to any of the previously listed models. In this case, you can check this link and take advantage of the Slingbox Upgrade Program.
Slingbox Upgrade Program (US)