There are a number of things that might keep your tablet from showing up in the market. Here are the things you can set in the manifest to try to include it, I guess I would say maybe you should set them all and see if it works.
<supports-screens android:resizeable=["true"| "false"]
android:smallScreens=["true" | "false"]
android:normalScreens=["true" | "false"]
android:largeScreens=["true" | "false"]
android:xlargeScreens=["true" | "false"]
android:anyDensity=["true" | "false"]
Read about it here:http://developer.android.com/guide/topi ... ement.html
Here's another one they wrote about screen resolutions:http://developer.android.com/guide/prac ... pport.html
And this one might be helpful:http://developer.android.com/guide/topi ... ement.html
But of course you've probably seen that. A tablet presents special problems because of the larger screen. Maybe you have all of that set right and something else is wrong. Maybe it asks for permission for something this tablet doesn't have, like vibrate or phone state (just examples). Sometimes the market rules on the processor.
I will say you probably want to use the proper supports-screens for that device otherwise compatibilty mode will be turned on and the market might leave it out because it might not look good.
Probably one of the most confusing things Google has come up with so far.
Hope this helps.